Probably Doubling up with seat posts.
Finally new front seats arrived today.
Ex Toyota Hiace Commuter 10 seater
In really good nick, only a small amount of mod work to bolt them down and could even fit a couple of rails for adjustment.
They both recline back to about 60 Deg and are only 855 wide at the base.
They are covered in material but I might cover them in black vinyl for weather proofing.
Only cost $210.00 delivered,
Took some pics below.