I have found that the best source of parts for any make of tractor is a good auto parts store or industial bearing distributor.  Most bearings, retainer rings, pistons, oil rings, seals etc. are of common size.  Just determine your dimmensions and they will have no problem finding them.   I don&#039;t have much luck with the Auto Zone style auto parts stores, usually do best with the small store that does lots of business with the local community or is associated with a machine shop.  I have never bought parts from one of the places that specializes in reproduction or NOS parts.  Just to expensive in most cases.  Something else that has worked well for me is to purchase a basket case of a tractor for parts, use what I need then sell the remainder.

Hope this helps.