Am currently running 55W Halogen fog lights. I found LED lights that plug into the housing with no modification. Does anybody know whar size resistor I would need to make the lights perform properly. With no resistor they are barely visible.

Check this link and you may get enough info to figure it out:

http://www.ninjette.org/forums/showpost.php?p=11310&postcount=1

Sam, Thank you. I will be visiting NAPA tomorrow.