If you look at one that has one, I think the tailgate and 1/4 panel are different, they have the threaded inserts welded in that the spare tire frame mounts to.
My friend Dan's blazer keeps getting bumped in the back and each time he does that damn rack bends the crap out of his truck! He has had it repaired 6 times and it has never cost less than $2300!:cuss: