Ben,This KB car has nice front and rear rubbers but the door rubbers are not very good and since the door does not have a glass frame it would be better to get the original rubbers.
since you may be interested, I thought maybe you should try to contact the Borgward Driver's Club UK to at least check if the have the complete rubbers for the Coupe door and the rear quarter glass.
and just fyi.. my friend made a bid up to 28k and the owner refused point blank and by the looks on the owners face I could see that he was totally unhappy with that bid. But time can change people.