IF YOU ARE UPGRADING FROM AN EARLY PRIOR TO 1994 FULL SIZE STARTER YOU WILL NEED TO USE NEW BOLT KIT # BK96 TO MOUNT STARTER 10106PMGR HI TORQUE STARTER FIT: Mercruiser; OMC; Volvo4-8 Cyl GM Engines with 12 3/4" FlywheelDrive End has Straight Across Bolt PatterenMarine Power #0172-000Mercruiser # 50-806963A2& A4; 50-806965A2; 50-812429A2;50-806965A2; 50-812429A2Volvo# 3854750 & 3856003OMC# 988217; 3954750; 3850526; 3855882; 3858463; 3856003Delco#9000763; 9000820; 9000822 Arco# 30460 Sierra# 18-5919.