[AL427SBF]

Searched the internet and couldn't find a thing. What are the rules for placing number(s) on cobra replicas participating in sanctioned track or road course events?

Is there a min and max size?
Can they be up to 3 numeric or alpha-numeric characters like 621, 21A or A21?
How many places and location do they need to be located -

hood & side?
side & trunk?
both sides?
... some combination of the above?

Hopefully these race sanctioning bodies (for our replicas) follow some sort of standard, thanks for any info related to this.