Mercury - Basic Gear Housing Assembly - Silver - Fits 5.44 Torpedo Lower Units Only - See Below for Applicable Engines - 8M0117269 200 HP Verado 6 Cylinder - Serial number range 2B144123 through 2B578935 225 HP Verado 6 Cylinder - Serial number range 2B144123 through 2B578935 250 HP Verado 6 Cylinder - Serial number range 2B144123 through 2B578935 275 HP Verado 6 Cylinder - Serial number range 2B144123 through 2B578935 300 HP Verado 6 Cylinder - Serial number range 2B144123 through 2B578935 350 HP 2.6L L6 Pro Verado - Serial number range 2B141124 and above 350 HP 2.6L L6 Verado - Serial number range 2B141617 and above 400 HP 2.6L L6 Verado - Serial number range 2B618256 and above 400R HP 2.6L L6 Racing - Serial number range 2B141124 and above