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: 72 Ranchero/Torino (before 1/15/72) 351, 400,429, 73/78 Ranchero (351,400,429,460)-11 x 2 1/4" Brakes)72 Montego (351, 400, 429, 460)- before 1/15/72