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I had a small one made for the front of my Impreza, Police just hate it when you make the rear one ridiculiously small due to their cameras not being able to pickup details as they drive behind you.
If your car is an import you can get away with having 64mm high lettering instead of 79mm (size and spacing of characters regulation 14a)
I got mine made up to order at Fancyplates.com