[SCOTI]

Originally Posted by MikeB

I thought all 73-up truck rotors are 5 x 5, even the light duty models in the 80s with 1" wide rotors. Other than re-drilling yours, you'd have to adapt passenger car rotors and maybe even spindles, and you'd end up with a very light duty setup.

Correct.

5x5" for 1/2 ton trucks. Different rotors for Lt duty (1.00"w) & HD (1.25"w) which have different bearing set's. The Lt duty rotors bearing set is common w/the F-body 1Le brakes which gives the car pattern but requires the Lt duty spindle & caliper set-up which is technically downgrading vs the thicker rotor.

To keep HD 1.25" thick rotors & get a car pattern, one would have to re-drill the pattern, use adapters, or wait for some aftermarket company to make some.