I agree David...I think Hanno is on the money. An 8cwt artillery tractor....how lovely it would be, doesn't sound very realistic. A C8 doesn't even have a towing hook...nor a winch, so any artillery heavier of bigger than a plastic scale model sounds like a challenge
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After having a look at some factory photos I think the centre two seats in the back of a FAT are of the non adjustable type. They seem to be bolted straight to the floor, seat 1 and 4 in the back are adjustable, as are the ones up front. So, it sounds like "'Seat Assembly" includes the folding seat, as well as the runners. It seems the angled plate to secure them in the bed of a C8/F8 is not included, as this is different from a FAT......the angled plate might even be unique to the C8/F8 (?)
Alex