I parted out an early Series III station wagon a while back.
It came partly stripped and the only pictures I have aren't too clear but as you mention the centre seat mounts off the same bracket as the outer seats. It's Y shaped at the top for the inner & outer seats to bolt to but when you have adjustable seat frames there is a seat rail with just a single bracket (hope that makes sense).
DSCN4030 by Colin Radley, on Flickr
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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