THE BLUE PLATES LOOK SO GOOD!!!
The only way you can get vintage blue plates onto your car is if you have proof (old registration) that those plates were once registered to that specific car once upon a time. But your plates weren't, so you can't get those plates registered to that car through the YOM (year of manufacturer) program. (that program only covers up to the black plate years anyway, blue plates are out.)
BUT, there is a way to do it.
Order new white vanity plates with the same ROZ K letters. Once it's all registered and approved, put your registration stickers on the blue plates and use them instead. Nobody will know the difference, as the police don't get a notice that your car should have white, blue, black, or any other plates when they pull you over.
While you're at it, consider ordering the vanity plates in the new black and yellow style. Then simply paint the black part blue, and run those instead. So that your original blue plates stay preserved and safe.