OEM MC39953 brake cylinder is an aluminum brake master cylinder which is equiped with a plastic fuel tank. The bore diameter of this master cylinder is 1″ (=25.4mm). There are two outlet ports which thread are M10x1 & M12x1. It fits for Ford Explorer 1991-1994, Ranger 1990-1994; Mazda B-Series 1994, Navajo 1991-1994. The reference number is F122576 F122577 M39953, 130.65037, M3083 13-2532, 132532 12575 F0TZ2140A 13-2532 MC39953