I'm going to use the US lenses. That's what is on the car. I need to redo all the wiring cause it's all rotten and falling apart. So, I can just copy what they did, no problem, and have the b/u lights as turn signals (with orange bulb) and presto - EURO approved. So no, we don't need EURO lenses. With this setup, we have what is required.
But I have just devised a wiring schematic with a couple of connectors that (I hope) will make me able to flip back and forth between US and EURO setup by just plugging a different connector in under the car - and one under the column.
I just want the US lights, cause thats just cooler here where we never see it. It's not legal, but I just don't care. If my evil wiring schematic works, it's a matter of seconds to change over 🙂 That is why I had to ask how the US lights actually functions.