Duramax CP3 Pump Flange Adapter Spacer – GM Chevy GMC LB7 LLY LBZ LMM – 66-1FA

This is a used Duramax CP3 pump flange adapter spacer.

It’s been mounted before but is fully functional—just some cosmetic wear here and there.

Interchanges with 2001 through 2011 model years: LB7, LLY, LBZ, LMM.

Manufacturer part number is 66-1FA.

Brand is listed as GM Chevy GMC Adaptor.

It’s a high-pressure injection pump spacer, goes between the pump and the engine.

If you’re swapping pumps, deleting, or rebuilding, this little spacer makes it all line up right.

Not pretty, but works.

No warranty mentioned.

Solid core part.

Supersedes multiple year ranges.

If you’re deep in a Duramax project, you already know what this is.

Gets the job done.