Thanks gents, that helps, now to get some thick flat bar and tap it to take the bolts as unfortunately at the car end of this set up there are no mounts or fixings and the original parts are no longer available.
I am still trying to decipher what the 2 captive nuts are to connect to, does anyone have a picture of the set up here again the Rimmer / Moss catalogue comes up blank as parts not available but I am not even sure what they are for.
Thanks again