You might try some of the well stocked hobby shops, as over the past decade, there have been a lot of new introductions of colors, of product lines, etc. Some of the waterborne types are noteworthy too.
I knew a Porsche owner who bought a 3 dollar bottle of hobby paint rather than the overpriced paint from the dealership and had a perfect match.
Sometimes you cannot beat the mixed colors from an autobody supply house, but there are at least more options to check now.
Considering that the radio bezel is not going to get a lot of weather, they should be plenty durable.
There is a theoretical chance too- because the pigments are universal- that you could have a hardware store mix a can of Rustoleum, or XOrust White; to match the marroon, and save a few dollars.