SE206 (Replaces most Mercury 2.0L, 2.4L & 2.5L) | Sterndrive Engineering 90-206 The SE 206 gear case replaces most Mercury 2.0, 2.4 and 2.5 liter gear cases with 4-3/4 Bullet Diameter Email sales@macombmarineparts.com for application assistance if needed. CLICK HERE for an Installation and Removal Guide for the SE206 Replacement Lower Unit