These have been flagged up in another thread, however, I suggest the extra holes and nuts could be to mount an Alpina hub cap turning them into closed lug Alpinas as usen on later BMWs.
Just a suggestion.
The closed centers have a small ledge around the outside of the opening for the plate to rest on. I have no idea what those extra bolts are for. Definitely added later because one hole is over part of the Alpina stamp. And they're not symmetrical. Weird.
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