That cant be right... because the guy that I bought it from had a standard cab(non extended) and it lined up.. when I put it on my extended cab it barley did not... so that cant be right I thought the frames where 10 inches apart.. but i could be wrong but I know for a fact I am right about the bed lining up cause it was on my truck. Thanks
an extended cab and a standard cab with a short bed both use the same 6 foot bed, so i dont quite get: 
