Compatible seats for 78 series

I will “second” that suggestion, you may also find someone has a set for sale on the LCOOL site.

Macca.

Yep, they are not comfortable, but bloody handy. We have taken 3 adults on extended trips before, Darwin to the Roper River on a fishing trip, Darwin to Gove on a camping trip. Several Darwin to Litchfield trips. Got a few complaints about a sore backside on the the Gove trip :-). Just made a few more stops than usual.
Point is, without that 3/4 bench none of it would have been possible. The cost of hiring a vehicle would of been thousands and these trips would never have taken place.
Just wished I'd ordered mine with the 3 seater across the back. That is even rarer as the front 3/4 bench on those swivels sideways, allowing you to climb in the back.

Good luck