37050, 37052, 33432, 37052, 37052A Fits starter 33329 and 37000

 MTD # 751-11196, 951-11196 Ariens # 72403600, 72403500

Starter Gear - 16 teeth OD: 1-1/4",  Top ID: 3/8",   Bottom ID: 5/8" Height including rubber: 1-1/4"