Rebuild kit for both front ATE brake calipers, including new pistons and seals. With a piston diameter of 48mm this kit will suit both 1300/1600 (smaller) and 1750/2000 (large) ATE front calipers from 1967 onward. This kit will do both front calipers. Note that the pistons are cup shaped and do not have the original-style central pillar - you therefore need to snap off the central locating "pin" in your caliper body. Once fitted, this new cup shaped piston will work just as well. Also note - if you are using this on a Montreal brake caliper with the spacer block, you will require 4 extra caliper O ring seals available under code BR086.