Need help locating qty (2) rear R4 tires for my Kubota L3300. Dealer says 12.4 x 24 R4 tires to be used in rear with 10 x 16.5 R4 tires in front. Have found front tires and rims. Now need to locate R4 tries for rear. Dealer says I can reuse the original rear rims. Any help in finding a set of new or used R4 tires would be greatly appreciated.