Hi, Hans. When I finally got around to restoring my 77 Spit's seats, I
bought one of those entire interior replacement kits from Victoria British.
Taking the seats apart was very easy, as the original foam literally poured
out of the seat. What I did next was to buy a one inch by three foot wide
by six foot long foam sheet and two blocks of foam about one foot by one
foot by 3 foot for each seat. Using upholstery adhesive, I glued the flat
foam over the existing seat foam bottoms and back. This added an extra inch
of cushioning and brought the thickness of the foam back to where it should
be. Then, I used a knife and cut the side "wings" out of the foam blocks.
I did not use a pattern. I just hacked out a more or less triangular shape
bigger than I needed it. After gluing the wings in place, I slipped the
seat covers back on. I had to stuff the wings a little bit, but they
compress easily and provide much firmer side support than the originals
when you make the foams oversize. Total time: about two hours per seat,
including removal and installation. Handy hint: get a pair of hog nosed
pliers. These attach the hog ring staples used to attach the vinyl seats to
the metal frame. Trying to bend those staples around a metal tube with
just a regular pair of pliers will make you go mad and throw things.
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