By California law you cannot re-attach your own VIN plate with non factory rivets. The legal process is to take your car to a CHP Office for inspection by a VIN officer who will do a complete inspection of your car and then if all is well, will attach a Blue Tag to the door post of the car. That blue tag then becomes the "Official" VIN for the car.
Did it this way when i swapped the dash on my integra
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