As suggested, I asked ChatGPT about the correct gasket.
I've used Chat more recently and found it to be very helpful. It isn't always right, but if you suspect something is wrong, give it more information. Or it may ask for more. The fact that you can basically chat back and forth with it makes it much more powerful than just doing a google search. And going back and forth with a supplier eventually helped, after being told the correct gasket for my car was actually the wrong one. Moss/Rimmer did come up with the correct one eventually; the same one that Chat came up with.
For those interested, here is the link to my chat with Chat:
Chat chat
