The link you posted and any reference to ADRs and a plate is for imported 1989 cars and newer. Does not apply to your Ekly.
You should be good.
1970 Ford Mustang Sportsroof 302W/Toploader
1970 EL Camino 350/TH350 - The FrankenUte
2006 Jeep SRT8 - Big dumb US fun.
2007 FPV Force6 - Wife's car