Just following up on this one.
I sourced the following clips which are pretty close to the originals and fit snugly into the holes in the doors. The head size is just a tad larger, but ok. The head to base height where the doorcard fits is pretty much the same.
10 off for £2.99, worth having a play with at least.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290648075250&ssPageName=ADME:L:OC:GB:3160Seller is 227sparts
I will update when I get around to fitting the door card and see if I have the same issue as Gerhard.
Peter