this is for 72 ranchero, does any body know how wide a tire u can get in the rear fender with out rubbing.also how wide of a wheels and what back spacing the tire guy down at the local tire shop said i should be able to grt 295 or 305/50 15's in there.also said 15 by 10 with 5 or 6 inches of backspacing would fit.i just dont know.if anybody has done this setup before ,any info would be great