Everything You Need to Know About Harley Part Number

If you've ever ordered a Harley-Davidson part only to realise it doesn't fit, you already know how crucial it is to understand Harley part numbers. Whether you're a DIY mechanic, customising your ride, or managing a workshop, decoding part references helps you avoid costly mistakes, reduce downtime, and build confidence in your maintenance routine.

Harley-Davidson's part numbers aren't random—they follow a system. Recognising how to decode a Harley part code lets you verify compatibility, identify updates (like -A or -B suffixes), and distinguish between similar components across different model years. For riders or technicians juggling Touring, Softail, Dyna, or Sportster models, this is a game-changer.

At Legendary Parts, we stock thousands of OEM and aftermarket Harley parts—each with a unique part reference. Understanding the OEM Harley reference system makes it easier to search, compare, and select the right fit. And when it comes to aftermarket Harley parts lookup, part numbers often help confirm interchangeability or upgrade options.

Looking for the right fit? Use the part number to browse our OEM and aftermarket collection today.

What Is a Harley-Davidson Part Number?

A Harley-Davidson part number is a unique identifier assigned to every component, from exhaust brackets to gaskets. It ensures you get the exact part your motorcycle was built with—or an exact-match replacement if you're going OEM.

These reference numbers are typically found in your service manual, on the original part's packaging, or even stamped directly onto the component, and micro fiches. For example, a part labeled 61001-04 reveals not only the part type but also the model year it was introduced. That's essential knowledge when working on older or modified Harleys.

OEM Harley part numbers usually follow a standard format: five digits, a hyphen, then a two-digit year (and sometimes a letter suffix indicating an evolution). In contrast, aftermarket reference styles vary by manufacturer, but many use OEM references as a baseline to ensure compatibility.

Want to ensure you're ordering the right performance upgrade or maintenance piece?

Shop our range of OEM & Aftermarket Harley Performance parts at Legendary Parts and match your part numbers with confidence.

What Is a Harley-Davidson Part Number?

A Harley-Davidson part number is a standardised alphanumeric code used to identify each specific component on a Harley motorcycle. These numbers are essential for sourcing the correct parts, especially when dealing with multiple models, generations, or variations between stock and custom builds.

For OEM Harley part numbers, the format typically follows a recognizable pattern that allows riders and mechanics to verify authenticity and compatibility. These numbers can be found in various places: your bike’s service manual, on original packaging, or often stamped directly onto the part itself. Common locations include the underside of seats, inside engine covers, or on the body of electrical modules.

While OEM part numbers follow Harley’s official format, aftermarket parts may either use their codes or reference the OEM number for compatibility. This difference is particularly important when searching or cross-referencing parts online, especially for performance or cosmetic upgrades.

Understanding where to find the Harley reference number location ensures you order with confidence, saving you time, money, and frustration during maintenance or custom projects.

Shop our range of OEM & Aftermarket Harley Performance parts at Legendary Parts and take the guesswork out of your upgrades.

How to Decode a Harley OEM Part Number

Harley-Davidson part numbers follow a logical and highly useful structure. Most OEM parts are listed with an 7-digit format, such as 61001-04. Once you know how to read this code, you can better understand compatibility and spot newer revisions of older parts.

Breakdown of a Typical Harley OEM Part Number:

• First five digits = the base part code, identifying the type of component (e.g., a fuel tank, signal module, or camshaft).
• The last two digits = the model year the part was introduced.
• Optional suffix (e.g., A, B, C) = indicates simply an evolution.

Examples:

• 61103-83 → A fuel tank originally introduced in 1983.
• 68540-96A → The "A" is therefore a "new" reference.

Understanding this structure allows riders to confirm whether a part is compatible with newer or older model years and whether they’re getting the latest version. This is especially important for bikes that have gone through multiple design tweaks over time.

At Legendary Parts, we label each OEM part accurately and cross-reference it with Harley’s official numbering system, making it easier for you to find the exact fit the first time.

Common Suffixes and Prefixes in Harley Part Numbers

Understanding the suffixes and prefixes in Harley-Davidson part numbers can help you avoid ordering outdated components or misinterpreting listings, especially when browsing OEM or aftermarket catalogs.

Suffixes like “A”, “B”, or “C” = Updated Evolutions

When a part number ends in a letter (e.g., -96A), it indicates a revision to the original component. For instance, 68540 96B is a newer version of 68540-96A, which itself is a revision of the original 68540 96 signal module introduced in 1996. These updates may address design flaws, enhance performance, or improve compatibility with newer models. Always aim for the latest revision unless you're restoring a bike to its exact factory setup.

"-NOS" = New Old Stock

You may encounter “-NOS” in listings, especially in vintage forums or eBay-style marketplaces. This stands for New Old Stock, referring to parts that were manufactured years ago but never installed. These are genuine OEM items, often sought after for classic Harley restorations.

FXD, FLH, XL = Model Prefixes

In Harley's internal catalogs and dealership databases, you'll often find model-specific prefixes like:

• FXD – Dyna series
• FLH – Touring models
• XL – Sportster models

These prefixes aren’t part of the actual part number, but they help identify which Harley model family the part is compatible with. Understanding these codes improves your ability to filter parts based on your ride’s platform.

Where to Find Harley Part Numbers on Your Bike

If you're unsure which part is installed on your Harley—or need to confirm fitment before placing an order—you can often find Harley part numbers directly on your motorcycle.

Stamped Components

Many parts have part numbers stamped, cast, or engraved on them.

The references are often on the non-visible parts of the parts (e.g., inside the engine casing, behind the manifold, behind the meter, or on a label on the main harness).

Over time, these markings may wear off or become coated in grime, so gentle cleaning or a flashlight may help reveal them.

Owner’s Manual & Service Manual

Your bike’s owner’s manual usually includes basic part numbers for consumables, such as filters, bulbs, and fluids. For deeper maintenance, the service manual offers detailed exploded diagrams and complete reference numbers.

VIN & Digital Lookup Tools

Your Harley’s VIN (Vehicle Identification Number) can also be used in online tools or dealership databases to pull a full part list. Many diagrams from official dealerships or sites like Legendary Parts allow you to identify the exact part based on your bike’s year, engine, and trim level.

Whether you're restoring or upgrading, knowing where to find part numbers on your Harley makes ordering faster and more accurate.

Pro Tips for Ordering the Right Harley Part Online

Ordering Harley parts online can be seamless—but only if you follow a few essential best practices. Here’s how to avoid getting stuck with the wrong part:

1. Match the Year, Model, and Engine Size

Always verify your bike’s year, model name, and engine size before placing an order. A 2003 Softail Twin Cam doesn’t share parts with a 2015 version—even if they look similar. Verify these specifications against the part description or contact the seller directly.

2. Use Exploded-View Diagrams

Exploded diagrams help you visualise how parts fit together. These are especially useful for engine internals, wiring harnesses, or multi-piece assemblies. Legendary Parts provides these diagrams on many product pages, allowing you to compare part numbers and placement before you buy.

3. Match Colors, Finishes, and Updates

Don’t forget cosmetic details—chrome vs. black, matte vs. gloss, and version updates like -A or -B matter, especially when maintaining visual consistency or ensuring performance.

4. Read Return Policies & Compatibility Notes

Check for compatibility notes in the product listing and ensure the seller provides a clear return policy in case there's a mismatch. Double-checking now prevents return delays and additional costs later.

Avoid wrong Harley part orders by shopping with confidence. At Legendary Parts, we make it easy to order the correct Harley part online with complete specs, images, and compatibility info included in every listing.