actually not much difference from the 67,68s...just the ends are.... I was trying to have some made a few yrs ago, in metal, as the fiberglass etc arent very good...metal fabricator quoted me $10,000 for the die....it would take quite a few sales to make up for that investment....but if you eliminate some of the bends and creases ,it may be ok to make your own...maybe even get a 67,68 and add in the end pieces that you could make?