I searched all over for the FAA requirements for the registration number requirements and cannot find it. I know it must be at least 12" if plane goes over 180, flies to foreign lands, and must be Roman type (which is confusing because Roman type is with serifs, and that might be considered embellished, which is not allowed). Also, 'contrasting' colors, which is subjective, at best. Anyway, I can't find the spacing requirements or acceptable fonts. What I want is what I have below, but before I commit and buy both sides I would like to know I didn't blow $50 for nothing.