im looking for a set of bogarts but need to know what the difference is in the 15x31/2 and the 15x 4 and what the back space is actually taken from i know the 4 are 21/2 inches back and the 31/2 have either 11/2 or 21/2 anyways it going on a 00 civic h/b with 5 lug conversion any info would help