I am in the process of installing some Bitchin products floorboards. they came with a 3 inch rectangular tubing that you weld to the sills and it provides support for the new seam and also somthing to weld to


1950 custom streetrod build
http://67-72chevytrucks.com/vboard/showthread.php?t=296770

71 corvette conv, 525 hp big block