1956-1965 Corvette drum brake ear wheel cylinder rebuild kit with pistons - made with high quality EPDM rubber cups and boots for long lasting performance. For proper wheel cylinder rebuild, use a honing tool to refinish the bore surface. Wheel cylinder rebuild kit includes spring, rubber cups, end boot and pistons. Fits rear wheel cylinder on all 1956-1965 Corvettes except 1960-1962 HD brakes. 1" diameter inner cylinder bore.