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OK thanks for looking. The mystery remains, but to me the most likely explanation is that they had some leftover stock of old models which they used up in these sets.

Thanks for all your suggestions, ideas and other comments.
I did some googling but I'am not as smarter as before. I have seen some sets including a Plymouth Gran Fury police car...

Thanks again,
Linus

That sounds like it would go better with the date of the set.
Now you mention it, I think I've seen a set with that model in it.
Vectis or an American auction sight might have some achieve photo's of mint sets.

Cheers, Steve
Matchboxkiwi