Tire options limited------------

I ,too, am using 235/60-15 on 7" wides . With a 4" backspace . No tubs, no spring move in . Suggestion: Take a rim you are using . Go to salvage yard and get a used tire that you THINK might work . It doesn't have to be pretty as long as it holds air . Mount tire on rim and install on car . Check clearances . If you can get several tires of different sizes , say 245/60, 245/70, 255/50, etc., etc.. I think 235/60, 245/70 is about the best you can do without mods. Fronts can go narrower. Good luck