Oil Seal / Briggs & Stratton 399781SPack Size:1Briggs & Stratton 399781, Briggs & Stratton 399781SESF 161-057, Foley/PLP 161-057, J. Thomas 399781, NHC 266-5273, Oregon 49-047, Oregon 49-204, Prime Line 7-04057, Rotary 8825, Sunbelt BR-68, Sunbelt B1BR68Briggs & Stratton PTO side: 97700, 99700, 12A800-129800 and 104700Height: .312 ", ID: 1.062 ", OD: 1.693 "