McGaughys Chevy C10 1963-64 3.5/5 Lowering 6 Lug Power Disc Brake Kit 9" Bst Chevy C10, GMC C15 - 1963 1964 - 6 LUG (6 x 5.5) 2.5" Drop Spindles, 6 Lug 12" Rotor Kit, 9" Power Booster w/ Master Cylinder,1" Front Coils, 5" Rear Coils, Adj. Track Bar, Rear C-Notch, Non-Adjustable Proportioning Valve, Front & Rear Shocks