The belt drive output shaft is 1-1/8" inch diameter and 6 spine where as the standard PTO 540 RPM output shaft is 1-3/8" inch diameter and 6 spline
and is used on IH Farmall or International Cub and Cub LoBoy Tractors PTO shafts
The mounting arm in this listing is "square" shaped
and 20" inch SUPER CHIEF (SC) moldboard plow bottoms
L306H275 Undermount and Mid-mount Case-IH 275 Tractor
1 Point Fast Hitch Helper Spring Assembly with Mount for Farmall 140, 130, Super A, 100 Tractors The belt drive output shaft1 Point Fast Hitch Helper Spring Assembly with Mount for International and IH Farmall 140, 130, Super A, and 100 Tractors. Case IH Fast Hitch Helper Spring Assembly with Mount part numbers: 520714R1, 520705R91, 520705R91, 520713R1, 520708R11.