I am rebuilding the two bucket seats in my 69 and have purchased new seat bottom springs which will work perfect. The seat back springs are broken in several places and I am unable to find replacements for these. I tried 67-68 springs but they don't look like they will mount to the frame. Has anyone ever ran into this problem and found a decent solution? The only alternative I can think of is to buy the cushions with springs installed in them and not use the spring assembly but I am also looking for other altenatives. Thanks

Don't look at the internal spring foams as inferior. I think they are better. If it were me, I'd buy all buns and seat backs with internal springs. Do it once, right.