I have a flying buttress seat that was taken apart and black vinyl removed many years ago by the previous owner. I have some of the black vinyl, the seat bottom, and the seatback. It needs to be restored and reupholstered. As mentioned a S1 Euro spec 1750 GTV driver's seat from a LHD Alfa. It is tucked away in the garage rafters. If there is interest I can take photos. Make an offer.