1972 Seat Redo

[AlbertaClassic]

Hey guys, I'm new here. Been searching the forums (probably not hard enough) for info on exact dimensions of the full foam bench seat bottom and top foam and can't seem to find anything. Reason I ask is I have a monstrosity to deal with. The bench seat seems more like a couch than a seat. I would like to get a new cover for it and restore to normal size. The brackets and frame are the same as original as far as I can tell. Ideally I'd like to just cut the foam down to proper size on both bottom and top. Let me know thoughts please!