DOP951-12204 MTD Complete Engine Gasket Set for 4P90HU Engine No. 951-12204. This is a complete engine gasket set that includes oil seal (951-11499), breather gasket (951-12226), govenor seal (951-11574), gasket (951-12237), oil drain plug washer (736-04560), oil seal (951-11375), manifold gasket (951-12258), carburetor gasket (951-12261) carburetor insulator (951-12262), carburetor insulator gasket (951-12263), valve cover ring (951-12267), gasket (951-12271) and the head gasket (951-12273).