Mustang would be 4 1/2x 5 or BBP I believe. I had to back out of a SSBC kit for valiant. I went right to the store front. Placed an order for the kit, he said he would call when ready. He did, 6 months later, and for like 400$ more than summit had them listed. Needless to say, I was upset. A cash, out the door sale, was more than from a 3rd party. I understand wholesale, but holy cow. He was going to check on the price difference and never called me back.