If you make your own bases there are strips of timber on the foam side and also two narrow hardwood strips that the base rests on. If sized & positioned correctly the hardwood strips hit against bolt heads and stop the base sliding forward.

Exmoor can supply covers in 'elephant hide' if you want to keep it original. There was a thread on this somewhere.
Here it is http://www.aulro.com/afvb/series-ii-...ecovering.html
Drivers seat often had the adjustable base. Not sure if this was LWB only or an option.
Colin
Last edited by gromit; 27th March 2016 at 01:16 PM.
Reason: Link added
'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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