This pair of brackets allows you to adapt Z32 twin turbo 2 piston calipers and E46M3 rear rotors to the E46 330i and 330ci rear trailing arms in order to install a dual caliper hydrauilic handbrake setup. These brackets bolt through the e-brake cable hole in the trailing arm, so the drum parking brake assembly must be removed. CNC aluminum with gold anodizing, laser logos, and 12.9 grade hardware. Pair with our reproduction calipers, hydrobrake & hard lines and fittings set, all sold separately. Note: Must convert the foot brake to Z32 as well, because the M3 rotors are larger.