As far as I can see, there are are only two suppliers this side of the pond of after market parts for the Crossfire:

http://www.ctd-germany.com/

and

http://chrome-tec.de/catalog/index.php

Have I missed any (other than the odd listing on ebay)?

I'm currently in discussions with one of the remaining UK based suppliers of after market PT Cruiser accessories to see if they can also source Crossfire stuff in this country.