My car has seats like that. 1990 Porsche 944. In fact, any Porsche after 1985 has seats like that. Some don't have a power passenger seat, I think that was an option. Before 1985, many of the seat belt recepticles attached to the floor board. Look at the last photo's I posted, those are my seats. The seat belt reciptles attach to the seats, I just don't have them attached when the photo was taken.
Come to think of it, they don't fit your requirement since the seat belt strap is not attached to the seat itself, just the recepticle. I think a Chrysler Sebring convertible seat might work.
Last edited by marko69; 12-20-2012 at 03:29 AM.