Here in NZ we can use the number-plates the car was issued with, we have to have one front and rear.
We can update to another one if you lose the original one (or it's badly damaged) but the replacement won't have the same letter/numbers.
Our plates have six digits.
OR you can pay $$$ to get a personalised plate, the sky is the limit if it's not already taken - sadly 66 TBIRD etc were alrady taken.
So I got personalised plates with the same letters/numbers as th eoriginal Oregon ones.
And just left the Oregon ones on the car!
Not EXACTLY 100% legal but not been stopped yet!!
A Thunderbirder from the Land of the Long White Cloud.