Diesel injectors and high-pressure pumps are built to micron tolerances and are application-specific — two parts that look identical can be calibrated differently. The most reliable way to get the right part the first time is to match it by OEM part number, not by engine year alone. Here's how to do it.

1. Find the number on the part itself

Whenever possible, read the number stamped or etched on the original injector or pump body. This is the most accurate identifier you have — engine year and model alone often span multiple part numbers.

2. Use the OEM number, then cross-reference

Manufacturers like Bosch, Denso, Delphi, and Stanadyne assign their own numbers, and the engine maker (GM, Ford, Ram, Cummins, and others) assigns a separate OEM number. A good cross-reference ties these together, so you can match a Bosch number to its GM equivalent, or vice versa. If you only have one number, we can cross it to the others.

3. Confirm the application details

Have these ready to confirm a match: engine family (for example, LBZ Duramax or 6.7 Power Stroke), model year, and whether the truck is stock or modified. Calibration can differ between otherwise-similar engines.

4. Watch for these mistakes

• Buying by year only — many platforms changed part numbers mid-cycle.
• Assuming "fits my engine" listings are exact — always confirm the number.
• Ignoring stamped suffixes — a trailing letter or digit can indicate a different calibration.

Let us confirm it for you

If you have an OEM or manufacturer part number, send it to us and we'll cross-reference it to the correct injector or pump for your application before you buy — so you avoid the cost and downtime of a wrong-part return.

Browse the fuel injector catalog, fuel injection pump collection, and fuel pump collection, or contact us with your part number and engine details.