Sierra 18-5908 Starter - Heavy Duty, No Core Sierra Starter Meets or exceeds the original equipment quality Sierra part number: 18-5908 Interchangeable with the following: Arco 30457, Crusader 42091, GLM 74170. Mercruiser Stern Drive 17251A4, 808011A3, 47455, 65784A1, 76965A1, 76965A3, 76965A4, 99419A3, 17251A2, 17251A3, 808011A4, 808011A05, OMC Stern Drive 982195, 984982, 981288, 986007, Pleasurecraft RA122009 Rotation: Standard Rotation; Mount: Top, Front Entry