Derek in Australia sent me some scans from manuals that show radio blanking plates for the different models. These should be considered ‘correct’ for all you correctness worryists. Check it out.
This is the 750 Spider blank plate -I have seen two different styles for these listed at Classic Alfa UK. The 101 version is all black where this one has off-white ‘wings’.
Maybe someday my car will be nice enough that the sort of radio blank off plate it has is at the top of the ‘to do’ list.