My 1949 came with some monster seats, that were welded to existing frame. Problem is, they cut off the back portion of the seat backs to make room for the new seats. I want to return to original seats, so I will have to refabricate the backs, including the hoop and the cross bands. What I need is the exact dimensions of the back of the seat. Hight and width. Can anyone take out a tape and measure their backs? Any help will be appreciated.