A friend of mine was walking around downtown yesterday while they were preparing for a shot that required a lot of Gotham PD vehicles. She managed to get a good picture of one of the license plates on the cars.
I'm just putting this out there as a reference photo. I have no ability to create replicas of this prop, but can see how it might be cool for someone to have a Gotham PD plate on their car considering how many 'My other car is the batmobile' bumper stickers I've seen.
The '0' on the plate does obscure a bit of the center image on the plate, overall its a pretty clean picture. Feel free to share the image if anyone has the inkling to produce some plates. :