Help ID These bucket seats (again with more pics)?

[joey8383]

SO guy came and bought some parts and spotted an old bench seat I have laying around. Wants to trade my bench for his C10 buckets!!! But when he sent me pics, I can't figure out what this buckets are out of. I posted this once before and guys were asking for pics from bottom. So here they are.
Also a pic of my bench. Should I still trade? I have another clean bench and really don't need two of them. THANKS

Here's my bench. Decent driver quality. Kind of brittle on the vinyl, especially on the top/rear of seat.


Here's his buckets