I'm in the process of buying some drag radials for my 2011 392 and ran into a problem. So far the only tire size for the 20 inch wheel is the 315/35 which is too large to run without fender well modification. What manufacturer makes a 20" DR that will fit without scraping. One tire/wheel company said the 315/35 would fit, but when I asked him if I could drive around the block after they were installed, he said "no, just in the parking lot." This tells me they will rub. So, what is my answer to the tire problem?