LONGBOX55 you are correct. What I should have said was, since your buying a crossmember kit designed to use (but not included in kit) S10 A-arms, spindles, and brakes, why not consider looking at getting the parts you'll need from a S10 2WD Blazer. '98-02 S10 Blazer 2WD trucks used dual piston calipers. Yes, you need the complete setup, spindles, bearings, rotors and calipers, but they simply bolt on in place of the stock S10 setup.
I would also be concerned with modifying a rotor for the same reasons you mentioned.
