I believe the diff is between the v6 and the 4 cyl models. The arb that you see for sale fits the 4 cyl models. They have a narrower frame width in the front for some reason. There is a write up for the bumper in question and then you can look up Justice's mounting on his new Gen 1 using a Gen 2 arb i think
John

SOLD!!: 91 LS 95 SR Rear LSD front 95 LS front brakes Dons Bumper 10k Gorilla/Promark winch Safari Snorkel Dual bouncy 31's

1991 Chevy Suburban 33's. All other stock.