These are Style 81 rims. There is a replica being made by Rota , the Philippines mag wheels manufacturer. Apparently, I heard that they do OEM rims as well, so the Style 81 rims may be factory "seconds" with some minor imperfections in them.
It has 3 series (ET45) and 5 series fitment (ET 20) for 16 inches and 17 inches sizes.