Back in my upholstery shop days, I installed inflatable lumbar
supports in my friend's '66 camper and in my own '86 Honda Civic Wagon.  I
don't recall the brand name, but I know it wasn't Recaro.  There were two
varieties: a single valve model with a single, pleated air chamber and one
with three seperate chambers, each with their own release valve, for
"optimizing the shape."  I recommend the single valve variety.  It's cheaper,
less fussy, and works better.  Any auto upholstery shop should be able to get
these from one of their suppliers.  Cost: roughly $40-$80 a piece, if memory
serves, and worth it, IMO.

-chris
'87 Syncro (with a rolled-up sweatshirt jammed behind my lower back on the
driver's seat)