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I use the crystals for all sorts of lights on my trucks. I like the 2 mm and 3 mm square for scene lights. Some of them are a bit too reflective in the clear so a little dull coat helps.
I haven't bashed the Amercom models but many of the details are raised relief. Are you sanding them off and replacing them with crystals? If not try silver paint marker and then clear colored pain or marker over top. I have even used Bare Metal Foil then the colors.