New wheel cylinders are made to excat factory specifications. Please check application list closely and verify your bore size before ordering to insure correct parts. Applications list is as follows: fits 65/70 Falcon with 27/32 inch bore drum brakes. Fits either side. 64/68 Falcon sedan, hardtop (6cyl) -from 8/16/64. 65 Comet hardtop, sedan (6cyl). Fits 65/70 models with 6 cylinder and 27/32 inch bore.