This system showcases the impressive S4 4-piston caliper, paired with a sturdy 12-inch, one-piece slot-drilled, zinc-plated rotor. The S4 caliper comes equipped with D.O.T compliant dust and weather seals, and it utilizes the widely loved DR1 or HB100 pad type. What’s really neat about Baer's design is the unique backing plate; it not only serves as a caliper mount but also cleverly incorporates a modern one-piece park brake shoe assembly. You’ll also find stainless braided hoses included for added durability. The 12-inch SS4 is compatible with most wheels that are 16 inches or larger. This setup fits 1967-69 GM F-Body Cars with OE Small Pattern 10/12 Bolt Bearing on Axle (BOA) Housing Ends, and it also accommodates the Hybrid 10/12 Bolt Non-Flush Mount 3.150" Bearing.