I can tell you this much..
20 = 20 Inch bar
8 = 058" (Thickness of chain- IE groove thickness)
SL = sprocket nose
H= nose radius - big deal
D009 = motor mount type
The Oregon book- "product catalogue & application guide" I have is 1985 and D009 is not listed. Maybe a mower shop can help as this book is updated all the time![]()


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