You need 68mm for the e89.
You can buy actual caps, I think BMW originals can be had on eBay for £15 but make sure to buy the newer kind not the dated type with both chrome and plastic surround. Alternatively you can get 68-70mm metal domed stickers.
The stickers actually look better than the caps because they have no chrome surround and cover up the existing BMW chrome border, even better for black alloys. Just make sure to apply it carefully because once stuck you can't get it off without damaging it.
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