This Mustang II kit uses large single piston GM calipers to provide ultimate stopping power for your Street Rod. Kit includes: Multi-pattern rotors, calipers, multi-pattern hubs, brake hoses, bearings, seals & necessary hardware. This kit also gives you the option of a 4 3/4" or 4 1/2" bolt pattern. NOTE: These kits require 15" wheels or larger! For cross-drilled and slotted rotors add: $125.00 for Optional Cross-Drilled and Slotted Rotors