McGaughys Chevy C10 1963-64 2.5/4 Lowering 6 Lug Power Disc Brake Kit 7" Bst Chevy C10, GMC 1000, C15 - 1963, 1964 - 6 LUG (6 x 5.5) Drop Spindles, 6 Lug Dic Brake Kit, 7" Booster/Master Cyl., Front/Rear Shocks, Non-Adj Proportioning Valve, 4" Rear Coils