I have a '11 fxdb. I'm wanting to upgrade my headlight bulb. There was a thread about this, but I can't locate it. Anyway, I want to pick up a brighter bulb, but the only part number I can find is the HD #. Will a regular auto bulb work, what part number do I need, and anyone have opinions on the brightest brand?
Thanks

 

These are the droids you are looking for:

Bulb, H4 Halogen, 80/100 watt. Osram/ Sylvania brand

http://www.germanautoparts.com/Hardware/Bulbs/H4

 

Look into the Sylvania Silverstar, about $20 at any local autoparts store. I replaced the stock bulb with the Ultra after 1 night ride. Huge difference!