AP-Racing 2-piston aluminum brake caliper: -Fits well for ventilated rear brake discs for Escort BDA Grp4 -Piston diameter 50.8mm -Brake disc diameter 254/267mm -Brake disc thickness 20.7mm -Side mount -Aluminum pistons -Weight (without pads) 1.8kg -Hydr. threads 3/8x24 UNF -Mounting hole spacing 88.9mm -Mounting offset 29.7mm -Brake pad type FROFRP202. -Fits eg. Ford Escort BDA/historic Group4 Note. When ordering the product, remember to select right or left caliper under "Model"