Fitting a rear seat (not the rear facing kiddy seat) into a 940 estate. This car has never had a rear seat fitted (tax reasons in norway!). Cannot work out how the spring and clip are inserted into the ends of the seats to hold the sat in place (where the seat is mounted into the car chassis - down beside the seat belt fittings beside the doors). Anyone have pictures or drawings or helpful hints on how these items are fitted?

Thanks