Might be onto something here. As ankgupta said, our 3.5 wasn't listed. But that is out of their pdf manual that is probable outdated since their website is being updated. For s@#t's and giggles, I took the part number for the Isuzu 3.1 V6 and it crosses to many GM motor's. Will contact them and see if I can get a updated PDF catalog. IF they help out, will start the process of building us a cross reference list for everything I can cross. Keep your fingers crossed.