This is a Brand New Genuine OEM PTO side oil seal # 31950. 

Fits Tecumseh HM, VM 70 - 120, OH 120 - 180 PTO side
TECUMSEH: PTO side: HM, VM70, VM80, VM100, VM120 and OH120-OH180

 

OEM:
BRIGGS & STRATTON 391086S
BRIGGS & STRATTON 4117
BRIGGS & STRATTON 298423
BRIGGS & STRATTON 391086
TECUMSEH 31950

Fits Models:
BRIGGS & STRATTON: Magneto side: 176400, 19B400, 19C400, 200400-233400, 243400, 250400-259700, 28A700-289700,40A701 and 400400-460700; for 7 thru 18 HP engines; PTO side: 170400-176400, 19B400-196700 and 200400; for 7 thru 15 HP engines