1956-59 Transmission Extension Housing Seal – Ford-O-Matic 3 Speed – Ford 312 V8 With Dual 4 Barrels – 312 V8 With Supercharger – Ford Station Wagon With 312 V8 1956-57,

Overdrive Housing Seal – Ford 312 & 332 & 352 V8 Only 1957-59,

Ford-O-Matic 3 Speed Transmission – Ford 352 V8 With 1.68″ Output Shaft 1958-59,

Ford-O-Matic 2 Speed Transmission – Ford Only 1959,

(OD 63.60mm)  (ID 41.50mm)