Rat Rod said:.
Was thinking along the lines of a 3" x 2.5" metal embossed plate like this.
If i may offer some input, albeit late. The letters on this example are too close together to be embossed at any noticable depth. You would end up with more of a large island. You would then have to stamp the letters color on rather than roll the paint on to the letters, if that makes any sense? I would say your example would work beautifuly in print form. You could do a screen print on a flat plate for not too expensive but it would be 2D. OR you could print a water-slide decal and aply it to the plate for probably less money and you could do it yourself. If you have a good laser printer and go with the bake on decal paper and a couple coats of clear, it would be very durable. The nice thing about the latter is that you could have the image edited with a 3D look and even have it made to look like an old worn licence plate. You would have to get pretty close to notice its a decal. This would keep your cost down as you could make them when needed. You would have to prime and paint the light color on one side of the plate (beige). Your decal would have only the black on it. You could go with a thicker plate as its not being stamped .04" to .06". I could make the plates for you if you supply the dimensions for the plate and mounting slots. They'd be shipping from Canada though.