I think you'll find the one Rodney has posted pics of is for the N66 Rally rims and the round one Greg has is for the N67 Alloy rims.... my memory is a little vague but I seem to recall the plates on my Sandman vans in the 80's had side cut outs like Rodneys but I never really took much notice of them back then.

The big question is does Greg have an original N67 Alloy rim to compare against and does the round plate fit through the hole and sit snug in one?????