To throw in what I believe to be a new bumper rule,
Quote:
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R35: The numerals must be at least 4 in. high, at least ¾ in. in stroke width, and be either white in color or outlined in white.
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Emphasis mine.
The 148 numeration method of stenciling in with a silver sharpie is obsolete I guess, unless you're able to make a white sharpie show up. Bumm(p)er.