Little wonder replacing tires/bearings

Hello guys I have a 9hp gx270 little wonder push blower been looking everywhere for tire wheel assembly for it I need bearings wheels and tires for all three. This blower has been pushed to death. I called little wonder tech support for a parts manual and the tire/wheel part number is no longer available. Had no idea something this simple to buy would be so hard. Thanks before hand if you guys know. Thomas from NC
Part #920300 is the two rear wheels and the front wheel is a different size...

Little wonder replacing tires/bearings