GLM Boating GLM 71120 - Rotor For Mercury 811636-1; OMC 986651; Volvo 3854261-9; Sierra 18-5406; Mallory 9-29220 GLM Part Number: 71120; Sierra Part Number: 18-5406; Mercury Part Number: 811636-1; OMC Part Number: 986651; Volvo Part Number: 3854261-9