HD sells a passing light kit for the FLHX.
Custom Auxiliary Lighting Bracket Kit | Harley-Davidson USA
I like Kuryakyn's on a Street Glide myself:
http://henleyskustompainting.com/oscommerce041011/images/touringkuryakyndrivinglights5005flht97-09a.jpg?osCsid=255eac6405a09378f0bf82f2c3f22180