what are some good grounding points for a cathode kit that i'm installing above my driver and passenger footwells?

 

There should be a wire already grounded to the left of the footwell of the driver side. Behind the plastic panel (which is easily removed) is a grounded wire. Unscrew that and add another grounding wire.

Edit: Here are some pics for help:
Remove the plastic panel first



Then unscrew the plastic nut and pull out. Although this is the passenger side and doesn't show the ground wire, the driver does have it.

 

thanks alot zlite