I installed a set "Hella xenon look" headlights a few months ago. They look great and the quality of the headlamp is as good as OEM. Afterall Hella supply VW.
They do take a H7 halogen bulb, I put in a set of philips extreme vision. They are not good enough. The halogens do not cover a good distance. In my opinion these lamps need a HID kit. I plan on getting one from HIDS4U next month.
With the new MOT rules coming in these may be a better option than OEM xenons without levellers.