Not sure if this is the correct section for this question, but does anyone have a photo or two of the interior of the seat back of a 50s Plus 4 showing the springs? My seat back has been replaced with thick foam and I want to turn it back to close to original. I remade one for a 1937 Series One, which has 2 rows of springs. I suspect the Plus 4 has 3 rows and there may be extra springs because it is wider.
