I am starting the rebuild of some 1989 seats and was wondering if anyone is aware of any replacement foam for these? There seems to be reproductions available for the early (1975-1988) seats, but nothing yet for the later ones (1989+). The foam in mine is not salvageable. I am hoping I don't have to start hand-carving new stuff from scratch. You would think with most of these seats being almost 30 years old there would be something available. Any thoughts? Thanks