For anyone else still trying to figure this out... I have glossy 20s from Tsportline and ordered these all black caps as mentioned earlier from wheelership.com:
OE GENUINE TESLA CENTER CAP W/ TESLA LOGO BLACK
CAP6666
They actually match nearly perfectly. I was worried they'd be matte and wouldn't match well but that is not the case. I imagine they match worse on the matte rims.
Also, they had no trouble popping in. No cutting or trimming involved. However, I did have to buy these to get the original caps off
https://www.amazon.com/Kaisiking-Su...3173&s=gateway&sprefix=heavy+duty+suct&sr=8-3. Just make sure you wet the cup and really press into it when you turn the handle.