It's hard to find the wheels from regular retailers but many have bought them on ebay, including me. You can get it in black or silver.

I forgot to mention that I also really like the fact that headlights intended for dynamos have shaped beams. They put a lot of engineering into the lens and reflector which puts most of the light at the far edge of the beam, and the beam also has a sharp cutoff. This means it's easy to aim the light far ahead while at the same time not shining it into people's eyes.

Most other bike headlights have round beams, and most of those have a hot spot in the middle of the beam. My eyes gravitate towards the brightest part of the beam, which is too close in.