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I recommend to follow the SCCA marking guidelines. Many of the panel vendors have no idea what's legal, so make sure to point them to the rules.
Excerpt of the rules:
D. Numbers and class letters should be positioned next to each other. All letters and numbers must be on body panels, not on windows. All numbers and class letters must use the same typeface and the same color, and this color must provide adequate contrast to the background color (see pic).
E. Numbers must be a minimum of 8” (20.5 cm) high with a 1¼” (3.25 cm) stroke. Class letters must be a minimum of 4” (10.25 cm) high with a ¾” (2 cm) stroke. In all cases, the height of the class letters must be between 25% and 75% of the height of the numbers. Stroke width must be at least 10% of the height (see pic)
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Autocross nut
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