vanity plates

On my 67 Dart about 10 years ago or so I realized the new plates had two numbers(designating the county)a letter then 4 numbers, so I waited for about a month and got "62A 1967", then I went to historical plates and put on a set of 1967 South Dakota plates.
I dream of getting an AAR cuda and getting plates that read "AAR-ON" my first name.