Sgooter

I recommend the following source for good quality license plate frames, thin plexiglass plate covers, screws, screw cap covers, etc.:
autolicenseframes.com
As an example, their polished stainless steel thin license plate frame is the same frame you'll find on the accessories rack at your M-Bz dealer.
I discovered them yesterday and went to their shop and bought a few items, though they're primarily an internet-based company. I'm not associated with them in any way; just like to promote a good quality source whenever I find one.