MerCruiser Sterndrive Engine Coupler - GM V6 and V8 2-Piece to 1-Piece RMS Conversion Kit
New hub-style engine coupler with complete mounting hardware for MerCruiser GM sterndrive applications. Designed for converting from an older 2-piece rear main seal engine with 3-1/2" crankshaft bolt pattern to a newer 1-piece rear main seal engine with 3" bolt pattern. Compatible with all MerCruiser GM V-6 4.3L (262 CID) and V-8 5.0L (305 CID) and 5.7L (350 CID) engines paired with Alpha One, MR, R, and Gen II sterndrives from 1986 and newer. Also replaces couplers on earlier MerCruiser models: MCM 228 V8 305 CID (1977-1982), MCM 260 V8 350 CID (1978-1982), MCM 185 V6 4BBL 229 CID (1983-1984), MCM 140 4-Cyl 181 CID (1968-1982), MCM 120 4-Cyl 153 CID (1964-1982), and MCM 3.0L 181 CID (1987-1989). MR stamped. Kit includes studs, flat washers, lock washers, and flange nuts.

OEM PART NUMBERS:
Mercury/Mercruiser: 14505A2 / 14505-A2
OMC: 775495
GLM: 11520
Mallory: 9-72500

SPECIFICATIONS:
Type: Hub Style Conversion Coupler (MR Stamped)
Conversion: 2-Piece RMS (3.5") to 1-Piece RMS (3")
Engine: GM Pre-Vortec V-6 and V-8
Sterndrive: Alpha One / MR / R / Gen II
Hardware: Studs, washers, lock washers, flange nuts included
Condition: New

APPLICATIONS:
MCM 4.3L V6 / 5.0L V8 / 5.7L V8 Alpha Sterndrive (1986+)
MCM 228/260/185/140/120/110 (1963-1984)
MCM 3.0L (1987-1989)

⚠️ Verify OEM part number from your original unit before ordering to ensure proper fitment.