i have search and read but i could find any info if it can be done and if there is a write up on how to

i have the stock xenon head lights and would like to change to these
headlights
i have read if you have stock xenon you might need some kind of harness or other mods for it to fit and work anyone know how?

 

Not sure of any wiring harnesses or mods but those headlights you linked to specifically say:

DO NOT FIT MODELS WITH FACTORY HID/XENON

Did you check this against your year and model?

Otherwise there are plenty of other write ups on different headlights that you can try searching for on the forums.

Check this one out:
https://www.audiforums.com/forum/b7-...lights-158252/