i bought a m6060 with radil tires 420/170 r28 rear and 320/85r20 fronts they have the rim wweights on rear tires this tractor was bought for a farm project that never materilazied. i bought it right a few years back and want to keep it for my 5 plus acres of yard work. i however need a set of turf tires is there a r-3 type tire that will work on these rims? or do i need new everyting i called my local kubota dealer which has new owners and they never got back to me your help would be appreciatted thank you