For what it's worth, I tried white roundals with black numbers on mine and it looked dreadful. I also tried white rectangles and that was just as bad so I decided to go for white numbers with no roundals (see avatar) and see what was said. I've done four meetings in the car and no one has commented on them. even though they aren't strictly by the Blue Book. I would guess that so long as the numbers really stand out and can't be confused with sponsor logos etc., then that's all the officials are really concerned about.
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