1960-1965 Corvette drum brake front wheel cylinder rebuild kit - 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 boots and pistons. Fits front cylinder on all 1960-1962 standard & all 1963-1965 Corvettes. 1 3/16" diameter inner cylinder bore.