Adapts 4 piston, Z32 twin turbo aluminum calipers to E36M3 rotors on all E36M3 front knuckles. CNC aluminum with gold anodizing, laser logos and 12.9 grade hardware. INSTALL NOTES: Top bolt that mounts brackets to knuckles must be installed with bolt head on the outside and nut on the inside to clear the brake pads. The knuckle ears must be ground down flush with the caliper bracket to clear the caliper. Pair with our reproduction calipers. Adapt to the the brake lines in the car by adding to cart the lines and fittings set we sell separately, E3646FKCLF.