In Ontario your are allowed to plate “vintage” vehicles with licence plates made in the same year as your vehicle (yearly plates were manufactured in Ontario until 1973) under the “year of manufacture” program.
Obviously to do this you need to track down a plate made in the same year as your vehicle (reproductions are NOT acceptable), then make sure that the plate you’ve found isn’t already assigned to something (they provide a 1-800 number to call to verify that the plate is clean).
You then have to send the plate(s) along with the fee for vanity plates ($261) to the ministry for inspection and approval. If approved they’ll send them back to you with some papers you need to bring with you to the MTO on your next visit.
The rest of the process is the same as for normal plates – safety inspection, government fees and the like.
I have not yet decided if I can justify the $261 expense for the plates, but I have ordered a ’72 plate anyway (worst case it can hang on the wall above the project whiteboard).