The problem is a company selling something has a vested interest in convincing you to buy the product. Let's use hid lights as a great example. Google for "legal hid conversion lights" and youll get a gazillion results all screaming how they're eu marked, tuv this, dot that. Doesn't matter - you know as well as I do that they're not legal...
The regulations state clearly that the plates must be MADE of a retro reflective material. Metal isn't. Not sure where dubmeister can think otherwise personally.