1979 Ski-Doo Supplementary Shop Manual, Page 189Get this manual
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SECTION 07 (TOOLS)
Ring for roller bearing 420276020 Since 1971 All models except: 248, 249, 292, 294, 337640, 641, 775 420977 470 Since 1971 292,337,640,641,775 420876330 Since 1971 248,