No new info here, just looked some stuff up and 
thought I'd share.

Buell X-1 turn signal part numbers:

right front / left rear    68753-96Y
left front / right rear    68751-96Y

Yes, they really are only $5.  That's FIVE DOLLARS, $20 for ALL FOUR.

I haven't tested this, but I understand if you want 
the signals to blink at the normal rate, replace the 
stock bulb with a standard 1157 or similar bulb with 
a 23 watt rating for the turn signals.