This system showcases the impressive S4 4-piston caliper, perfectly paired with a 12-inch, one-piece slotted and drilled zinc-plated rotor. Designed with D.O.T compliant dust and weather seals, the S4 caliper is compatible with the widely-used DR1 or HB100 pad types. Baer's innovative backing plate not only serves as a sturdy caliper mount but also cleverly incorporates a modern one-piece parking brake shoe assembly. You'll also find stainless braided hoses included for added durability. The 12-inch SS4 is designed to fit most wheels that are 16 inches or larger, making it a great choice for your ride. This setup is compatible with the 1965-66 Ford Mustang featuring Ford 8"/9" Small Bearing Housing Ends.