Wilwood Forged Dynalite Rear Drag Kit Drilled Rotor Big Ford 2.50in OffsetFDL Rear Drag kits are true bolt on kits available for all popular muscle car rear axles and aftermarket rears built with custom axle ends. Kits in this group are purpose built for sportsman category door cars and others with full functional four wheel disc brakes. Based on the specific style of housing end and axle offset, mounting kits securely install the four piston forged Dynalite caliper over 3 8 plate steel rotors that are mounted to the axle