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Late 70's , early 80's thru mid 80's , because of the extra holes for the attachment of the anti theft piece that bolts on to the extra holes , for the large wire wheel cap , that goes on the 5th Ave cars and others.
I'm glad Frank stepped in, before I made an *** of myself with my guess. (I have some 15x5s with the extra holes like that. But they are for the alignment pins on my 49 that uses lug BOLTS, not studs and nuts)