Thanks guys but the "this end" is cranked and wont fit behind the inertia reel. Was the first thing I looked at.
When I took it off last year & put it to one side I bolted everything together loose, as you do, to keep it all together as a complete set. The fact that it has a very large ( 1"1/4 x 3/16 ) very rusty flat washer with a 1/2 bolt through it hanging from "this end" tells me it was bolted through the floor.
I think I have worked out that it was bolted through the floor about 6" in board of the reel and 4" in front of the back of the cab which would place it just behind the back leg of the seat. Or there about's but roughly at B
A photo of anybody else's set up would be very much appreciated as there is nothing in any of the manuals. Having originally been a retro fit there is bound to be a bit of variation.[frame]

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