Michigan Wheel High Performance Trim Tab is designed for use with Mercury/MerCruiser 4-3/4" gearcase. When using Michigan Wheel Apollo or Ballistic propellers, this trim tab is required. Vendor Part Number: 990404Applications: Mercury Outboards: 90 HP Command Thrust, 2014 & Newer; 115 HP Command Thrust, 2014 & Newer; 135 HP, 1987 & Newer; 150 HP, 1978 & Newer; 150 HP (Yamaha), 1979-1983; 175 HP, 1978 & Newer; 175 HP (Yamaha) 1978-1979; 200 HP, 1978 & Newer; 220 HP, 1987-1988; 225 HP, 1980 & Newer; 225 HP (Sea Pro/Marathon), All Years; 250 HP, 1994 & Newer; 275 HP, 1990-1994; 300 HP, 1999 & Newer; 3.4L, 1984-1986 (Includes DFI, EFI, Magnum, Offshore, OptiMax, Sea Pro XRI, Marathon, & Verado Outboard engines); MerCruiser Sterndrives: Models 1A / 1B / 1C / 120 / 140 / 145 DTS / 165 / 228 / 470 / 485 / 888 / 898 / 225S / 233 / 255TRS / 260 / 280 TRS / 330 TRS, Thru 1982; 120-190 HP, 1983-1985; 200-260 HP, 1983-1985, Alpha One 2.5L - 5.7L, All Years; Alpha One 6.2L MPI, All Years; Alpha One 262 / 350 / 454 Magnum, All Years; Alpha One 320 EFI, All Years; Bravo One 320 EFI / 350 / 377, All Years; Bravo One 5.0L - 7.4L, All Years; Bravo One D2.8L - D7.3L (Diesel), All Years. Fits Mercury/Mercruiser 4-3/4" gearcase | High Performance Trim Tab For Mercury/Mercruiser Engine