I have a different (approved) setup for two seats in my 110. Two braced posts attached to U sections bolted through the floor into captive nuts on backing plates on the underside of the floor. The plates are also rivetted so the whole setup can be removed when not in use. It cost over $600 four years ago!
Not very relevant to the 130, though, I am afraid. Trying to visualise the setup, I think the major problem is the lack of clearance behind the seat. But it should be possible to have an anchor bolt through the back wall of the cab, with an attachment on the outside of the cab to either the tray (which may be solid enough in itself), or with another link to a bolt in the floor of the trya nad from that to the chassis.  Something similar is on the seatbelt mounts of the cab/chassis late S3 that I have for the inner seat belt mounts.
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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