87 short bed brake rotors.

[frydaddys87]

i have been haven a time trying to find the right brake rotors for my short bed. the first set i bought was the wrong bearing size. the inside bearings were to small. the second set the rotor its self was to thick. the guy at the parts store told me 87 only showed a mexico built truck and that was wrong so he looked up a 86. they were to thick. and i know theres a diff from heavy duty and regular 1/2 ton but i cat find the right ones. any one know what i need for this thing please help!! im tierd of goin 30 miles each way with the wrong part. is the 87 mexico truck the one i need?