Wotcha,
I have Twin Headlights on my America and it was fairly simple, i basically :
Bought two 5 3/4 headlight shells online (cheap)
Bought two 5 3/4 Cibie headlights online (they're decent ones)
Bought two bulbs online
Had a bracket fabricated to fit them for about £25
and bought a twin headlight harness/relay thing from easternbeaver (attaches to the battery, runs up the body and is plug and play).
once i had the parts took all of 20 minutes to assemble (hardest bit is finding someone to fabricate the part).
looks great! (however sadly my bike hasn't been running properly for about 6 months now since i had some work done on the tank).
Ant
