I don't know about I-da-ho but in M*** if you are using YOM plates and two were issued in the year, but you have only one and the other is lost, they will let you go with one... Maybe check the I-da-ho RMV website (rather than ask someone at the counter, they usually don't know)....
<CITE>www.usri.org</CITE> <CITE>Check out this site. Idaho only requires one plate on the car but you will need to be a member and a matching set in order to register your hotrod with year of make plates.</CITE> <CITE></CITE> <CITE>Viva</CITE>