does anyone know what rear disk i should get the kid at parts store says there are 2 sizes. but didnt know anything beyond that:grrrrrr: I looked up the rpo code its g80 posi rear end , 04 tahoe z71. I only do normal driving and lots of highway so i just want standard rear pads and rotors. you,d think the parts store would have answers but not in my town I guess. at least i know where to come for real answers !!