The 631544 is a solid stainless steel, 4-hole exhaust gasket for Continental engines. Applications: O-470-B, -G, -K, -L, -M, -P, -R, -S, -U. Please note that some aircraft models or particular serial numbers may have applications other than those listed here. You must refer to the proper aircraft parts catalog, equipment list, or maintenance manual when choosing a part and for installation. Alternate P/N'S: 158, 537379.