It's time to replace the tires on my Duster. I have 185/75R14 on the front and 275/60R15 on the rear. Firestone Fire Hawks. I want to go to a taller 15" in the front. I don't seem to be able to find the 275 in 15". I would like RWL if I can get them. Coker and Firestone no help. Any suggestions? It would be nice to go online and see sizes available in a model of tire. All the sites want to choose car make/model or specific tire size. Not user friendly if you want to compare diameters, width etc.