I've seen 3 used for Parchment Rosette buckets with no rear seat, and I've seen 3 used for Parchment bench seat in the 70' and 71' years on some Marti Reports. I don't believe any bench seats were offered after the u14 production ceased in 72'. I'd say Parchment Rosette buckets in yours. Viperwolf1 can clear it up most likely.