Nothing exotic... plain panel vans (two Vauxhall Bedford CAs, and a Commer); and a van-bodied Landrover Series 3.
Though I think the Landrover did have a bench front seat so nominally 3 seats, rather cosily, if the middle passenger didn't mind legs tangled round the transmission-tunnel, gear-lever, range-gear lever and 2/4wd selector lever.
Oh, and a van version of the curious 3-wheeled Bond 'Minicar'.
I owned an ex-ambulance for a while and I suppose that could be counted as two-seater despite the long bed in the back. I forget what if any seats were back there too.