For 15” wheels, CPP offers a zero offset kit that doesn’t push the wheels out. I’m actually looking at gen 4 F body disc brake applications. They are a very minimal offset probably less then a 0.25”. Basically, the thickness of the rotor hat. There are a lot of people converting to the 98-02 LS brakes. They are 12” rotors and will require going to larger diameter wheels 16-17”. The 93-97 F body brakes are a similar setup but will allow the use of 15” wheels. This is what I’m looking into. While I like the latter 98-02 setup and going to a larger diameter wheel does not bother me, I would like to be able to run 15” wheels if I choose.