These kits include larger 13-Inch plain or cross-drilled rotors and our new modular design drop spindles. Must use 17-inch or larger wheels to clear calipers. 1967-1970 Chevy and GMC; Pickup Suburban Blazer and Jimmy 6-Lug 13-Inch w/ Spindles Plain67-70 Chevy & GMC Pickup & Suburban; 69-72 Blazer & Jimmy. These kits include larger 13-Inch plain or cross-drilled rotors and our new modular design drop spindles. Must use 17-inch or larger wheels to clear calipers.