I have the replicas that tape on. They have not yellowed at all. Fitment is pretty good, especially for how cheap they are.
If you see an actual set of BMW CF mirror caps you will notice how much better they fit. They are direct replacements for your stock ones and fit perfectly. We used to see them pop up in the market place for around $300-350 but I havent seen any in months. I could sort of justify the used price but the cost of them new is just too much.
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