the repro plates you are talking about are fiberglass, and an exact duplicte of state issued plates minus the 3M retroreflective material.
You would be hard pressed to tell the difference during the daylight, but I am sure a leo would notice it instantly at night time.
As for getting stopped with one, I am guessing a good BS line to say is "my front plate was missing, so I found this one, is there a problem?
Ignorance is no excuse, but it just might save you from an equipment violation ticket if it is noticed and a traffic stop ensues. I am guessing that a leo would need to be very Nazi-like to write a citation if the numbers match your current registration. But we all know there are many out there like that.
I have the website in my favorites, I'll repost with the address when I find it.
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