Ran across a guy on FB that has a NIB harness from Fuel Injection Connection that he made me a pretty decent deal on.

The only thing I can't remember is how relevant the ECM numbers are. When you order a new aftermarket harness, the manufacturer typically asks you what ECM you are using. The guy with the harness doesn't know what ECM he specified when he ordered it in 2011.

What are the potential issues? What ECMs are interchangeable?