Part number 43446DA - A New Original Rear Crankshaft Seal Retainer Outer Gasket For A Farmall A, AV, B, BN, C, Super A, Super A-1, Super AV, Super AV-1, Super C, T340, T4, T5, 100, 130, 140, 200, 230, 240, 330, 340 (gas, up to engine SN: 100500) Tractors. Old Part Numbers Are 43446D.