I posted this in the Tires Forum but no replies so I'm trying it here. I'm brand new to tractors and this forum. I just bought a used L1801DT(4WD with backhoe and loader) and one of my rear tires blew out. I would like to replace all 4 tires with R4 Industrials. Will R4's fit on the existing L1801 rims? Or do I have to buy all new tires and rims that will fit a L185??? Thanks!!