They are the original full set of factory manuals, all four volumes. Of
course, it's just the body/chassis one I'm concerned with.
One of the exploded views of the back seat backrest shows two metal
brackets sticking out the bottom, which appear to bolt onto something
somewhere, but no detail is given. Funny how they can detail the exact
number of wire clips needed to hold on the upholstery, but don't say
anywhere where the bolts are holding on the backrest itself!
Anyway, I'll try what you said. I can lift up on the corners of the seat
cushion, but it feels like something is holding it down squarely in the
middle. Maybe I was tired and didn't try hard enough.
('82 Mk VI, '97 GM, '99 E-350)