I have a double rear seat that I have just taken out of my 2003 ex AA T4 and am near to bristol. It has the built in lapbelt for the outer seat and the 4 "mushrooms" for the quick release mounting. It takes 2 headrests but I don't have those.
Hi - If you look on the cheep alloys wanted thread from simon there are pictures of the two twin seats I have available and im not far away from you - just past Bath .
Come with mushroom bolts - lap belts - headrests - etc