If your are looking for a company in the world, that can help you with getting parts for your bike, or can wrench on your bike and put our parts on your bike, have a look at the official dealer page from Twin Motorcycles. All these dealers are able to help you getting our Parts and putting them on your Buell or XR1200X or Sporster.
http://www.twinmotorcycles.nl/europeansupport.asp
http://www.twinmotorcycles.nl/europeansupport.asp