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ac in TN, Other than the oddball Roll-O-Matic used on the 1010 and 2010 tractors as far as I know all the Roll-O-Matic units are interchangeable from the 50/60/70 thru the last tractors to offer them, which goes quite a ways up into the New Generation. There are 4 basic Roll-O-Matic units, identifiable as what I call light, regular, heavy duty and super heavy duty. Light duty: Spindles B2711R R.H. and B2712R L.H. for the 50/520/530 Regular duty: Spindles A3471R R.H. and A3472R L.H. for the 60/70/620/630/720/730 and heavy duty for the 50/520/530. Heavy duty: Spindle R20258R L.H. and R20254R R.H. for the 3010/4010 and later tractors and heavy duty for the 620/630/720/730. Super heavy duty: Spindles R30387R L.H. and R30388R R.H. heavy duty for the 3010/4010 and later tractors. I would say the heavy duty ones are fewer and farther between and will cost more, but they are available as most have been taken off the New Gen. tractors and replaced with the more disired wide fronts. I have 4 720's and only my Gas burner has the regular duty Roll-O-Matic that it came with. One 720D has a light duty on it and the other two have the super heavy duties on them. Go figure. Hope this helps, Poor Farm Jim
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