Go to this link and see post #10 for a diagram to mod the circuit for always on lamps.
http://www.hdforums.com/forum/general-harley-davidson-chat/132689-passing-lamp-modification.html
If you like the passing lamps on the newer bikes , I have a set with bulbs from my 06 FLHT you can have for the shipping
cost , just PM me.
Personally I run sealed beam Wagner 4415A (amber) in my passing lamps , and I like the results , it seems like fewer people (oncoming traffic) turn left in front of me now.
These are 37 watt , screw terminal , fog pattern (wide) , sealed beams.
These can be had for $8.00-$14.00 per bulb at most auto parts/truck parts stores.
Remember proper aim is critical (and a pain in the butt) for best results.
Mick