my buddy finished up a 72 duster for his wife last year. he wanted rwl and at that time, i could only find a couple manufacturers that did those. bfg radial ta's and cooper cobras. there was another, but i forget. anyway, he used a 15x7 wheel on the front with a 4"bs, and the biggest tire we could use at his ride height in the bfg was a 205-60. if i recall, it was around 25" & change & 6"tread width. it was real close to the front of the fender opening at the bottom at one point in it's turning arc. that size filled the opening nicely. another size option would be a 205-70x15.