One-piece oil pan gasket for use with these Ford 351W oil pans: 11-660, 11-694, 15-670, 15-670S, 15-690, 15-694. NOTE: Canton Racing Ford one-piece & four-piece oil pan gaskets are NOT interchangeable. The Ford oil pan stamping that is used with a four-piece oil pan gasket is different than the stamping that is used with the one-piece oil pan gasket. The four corners where the oil pan turns down to go around the timing cover or the rear main cap are sharper on the four-piece gasket oil pan than the one-piece style oil pan. For a proper seal, you MUST use the gasket style that is appropriate for the oil pan you are using.