From inside (document excerpt):
FORM NO. 3321632 Rev A 1028 Power Shift Snowthrower Model No. 38558 9900001 & Up Model No. 38559 9900001 & Up R Parts Catalog 3321632 Rev A ORDERING REPLACEMENT PARTS To order replacement parts, please supply: the part number, the quantity, and the description of each part desired. Contents Description Page 1 2 Description Page Housing Assembly Housing Assembly (cont.) Transmission Assembly No. 66-8030 . Transmission Assembly No. 66-8030 (cont.). Engine & Transmission Drive Assembly Traction Linkage Assembly .
Handle Assembly . Handle Assembly (cont.) . Traction Drive Assembly . 9 28 ” Auger Gearcase Assembly No. 74-1561 (Model 38559 Only) 10 Engine Tecumseh Model OHSK 100-221605A . 11-16 Toro Part Number Index . 17-21 Note: Accessories Description 110 Vac Electric Starter Kit (Model 38558 Only) Light Kit (Optional Model No. 38558 Only) (Standard Model No. 38559 Only) Tire Chain Kit (For Std. Axle, Not For Use With Differential Kit Differential Kit Model / Parts No. Model No. 38039 Description Snow Cab Weight Kit (Required with Snow Cab) Drift Breaker 230 Vac Electric Starter Kit . Model / Parts No. Part No. 689500 Part No. 741190 Part No. 667970 Model No. 38041 Part No. 667941 Part No. 633040 Model No. 38038 Part Description Abbreviations Part descriptions in this catalog may include the following abbreviations. Abbreviation AR.