Napa shows 36678 & 36679 for 71 models both 20 & 30 series. For some reason they don't show anything for 72 or 73.
Maybe that is why GM has different part numbers for them. Something must be different, but so far, no one knows what. I always thought the 2 trucks were exactly the same. Some of the Vendors are combining their numbers for both though.
...I'll keep trying, lol.
Bill
