Mercury - Basic Gear Housing Assembly - Silver - Cambered - Counter Rotation - for 5.44 Torpedo Lower Units Only - See Below for Applicable Engines - 8M0145770 250 HP 4.6L V8 Verado - Serial number range 2B529482 and above 300 HP 4.6L V8 Verado - Serial number range 2B529482 and above 250 HP 4.6L V8 Verado - Serial number range 2B529482 and above 300 HP 4.6L V8 Verado SeaPro - Serial number range 2B529482 and above 300R HP 4.6L V8 AMS Racing- Serial number range 1E081459 and above