Mercury - Basic Gear Housing Assembly - Black - SeaPro - 5.44 Torpedo Lower Unit Only - See Below for Applicable Engine - 8M0145771 175 HP 3.4L V6 - Serial number range 2B529482 and Above 200 HP 3.4L V6 - Serial number range 2B529482 and Above 200 HP 3.4L V6 SeaPro - Serial number range 2B529482 and Above 225 HP 3.4L V6 - Serial number range 2B529482 and Above 225 HP 4.6L V8 SeaPro - Serial number range 2B529482 and Above 250 HP 4.6L V8 - Serial number range 2B529482 and Above 250 HP 4.6L V8 SeaPro - Serial number range 2B529482 and Above 300 HP 4.6L V8 - Serial number range 2B529482 and Above 300 HP 4.6L V8 SeaPro - Serial number range 2B529482 and Above