Mercury - Gear Housing Assembly Silver (standard X-Long) (Torpedo) (1.85) 1600-8M0142296. Fits 175, 200, and 225hp 3.4L V6 serial numbers (2B529482 & up). 175hp 3.4L v6Pro XS serial numbers (2B529482 & up). 200hp 3.4L V6 SeaPro serial numbers (2B529482 & up). 200, 225, 250, and 300hp 4.6L V8Pro XS serial numbers (2B529482 & up)