The Extreme+ system comes with the 1-piece Monoblock 6-piston, 6S caliper mounted to a 14", 2 piece slot, drill, zinc plated rotor. The 6S caliper is fully machined in Phoenix, AZ from a US sourced 2618 Aluminum forging, includes stainless steel pistons and abutments, D.O.T. compliant dust and weather seals and uses the popular D1247 pad type. Rotors are pre-assembled with NAS high grade stainless hardware. All mounting brackets, stainless braided hoses and hardware are also included. The 14” Extreme+ fits most 18” or larger wheels. Fits 1973-87 Chevy/GMC 2WD 1/2 Ton Trucks w/DSE Forged Aluminum 2.5" Drop Modular Spindles