I am in the market for a set of rear R4's for my Kubota B2150, I currently have a set of Trac Loaders on the front that have a diameter of 23" so I need something around 38 1/2 diameter. could also be interested in a full set of AG's for the right price. Looking in the Detroit Flint Michigan area. Trying to match my ratios at about 1.66ish. Thank you much, Mark.