There seems to be few original door card clips available, and if they are the prices are very high - I saw one at £20 per clip.
I did some research and found this alternative route which works superbly so I thought I would mention this on this forum as it might be useful.
You can also search the OEM numbers for many suppliers.
Beta Door Card ClipsThese clips work for the beta door cards, just saw or file out the middle band and remove the clear plastic clip receptors on the doors.
Best to open up the door cards behind the hardboard with a screw driver for easy fit, twist each clip into the slot.
8mm Interior Trim Clip / Fastener for Trim Panel, Door Card.
OEM Part numbers : BMW 51411973500, FORD 99950758240
https://www.ebay.co.uk/itm/371434464771?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=aiUWzZxKTF2&sssrc=4429486&ssuid=MNzi2RlJS1O&var=&widget_ver=artemis&media=COPY