You can also do it by mail. If I was any good at this, we'll try any way, I could help you.
You can go on line at
http://www.tax.ok.gov/mvforms/750-b-09.pdfKnowing my short falls I'll try another way...
http://www.oktax.ok.usclick on left Motor Vehicles
click on Special Plates Registration Forms
click on Vintage Decal App
They only issue on a calendar year basis. I send my in eary Dec and get by the 1st of the year. I don't know if they will issue any other time of the year. Fee is now up to 21.50 (20.00 plus 1.50 mail fee)
You also have to sign that it is an official OK license plate which is at least 21 years old. How they'd know if it came from a site that makes NEW old plates I don't know but it leads me to think they are not legal. ( only REAl OK plates...but the sites make them look so real I THINK you could get by)
Send/Contact:
Oklahoma Tax Commission
Motor Vehicle Division
Special License Plate Section
2501 Lincoln Boulevard
Oklahoma City, OK 73194-0013
405-521-2468