Just check that the diamond shaped clip is still in place on top of the pop-up washer as they often come off with the cover, they can only be bought as part of the washer and is not sold separately. Both the clip and the cover are handed and are not interchangeable L - R.
The caps are a bit overpriced for what they are from BMW, but the washer with clip is a lot if all you need is the clip (£80+) someone has previously posted about a Volvo clip being identical and available separately which is way cheaper, worth a search if you need the clip as well.
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