Yep it looks like my options are to drill the fender or replace the light bar. I was hoping to avoid the expense of the light bar, so we will see. I solved it temporarily by using zip ties and attaching the plate to the bag guards, perhaps not the most elegant method but it works for the time being I guess.

 

Don't know where you live but down here it would be an excuse for the law to pull you for it not being lighted if you mounted it that way. Here is my set up. You can just loose the light bar and move the signals down. Then all you need is a plate holder and a taillight lens with a down light window instead of the factory one. The bike in front of mine is a road king as well with a used Street Glide setup installed on it. I think he paid like 50 bucks for the whole thing on e-bay.

 

Softbrake makes a plate that goes below the light and matches the holes exact. I used the "bolt lights" that are commonly available and wired them in.

Cleans up the look and no drilling