IF YOU ARE UPGRADING FROM AN EARLY FULL SIZE STARTER YOU WILL NEED TO USE NEW BOLT KIT #BK95 TO MOUNT STARTER 10099HDFITS:Mercruiser, Volvo Penta, Marine Power & Others Including 3.0 and V6 - V8 GM Engs with a 14" Flywheel 12V 11-Tooth CW PMGR STARTER MERCRUISER# 50-863007A1; 50-864340A2VOLVO#357625; 3587625; 3860565; 3885317Delco # 9000840; 9000884STARTER 10099HD IS MANUFACTURED WITH STEEL GEARS Arco# 30470 Sierra# 18-5913MarinePower# 475447 Starter #10099HD replaces the 10099DR Plastic Gear Starter AND THE EARLY FULL SIZE STARTERS.