After you get it to fit right, Prepare yourself for the whistle. I chased a noise all last week, turned out it was the trim ring. Sounded like you was holding a pop bottle out a car window, Liked to drive me nuts.

 

that is exactly what I did...but big gap at the bottom...maybe 1/4 inch

 

Here's my trick to modify the headlight bezel if you're using a "french" or "visor" trim ring. Harley wants you to install the OEM trim ring underneath the new trim ring. I find this to be a crappy way to do it. However, the new trim ring is too loose without it.

So, what I did was install a series of eight small screws around the headlight bezel. The screws are 8/32" and placed evenly around the bezel while ensuring the headlight adjustment screws or the bezel-to-fairing mount screws are not obstructed. With a small nut on each side, these screws act as posts that fit inside the back-edge lip of the new trim ring, providing a secure and snug fit while eliminating the inner / OEM trim ring completely. And of course, this also gets rid of the trim ring gap as well.

 

another way of doing it is:
- remove the stock ring.
- take up the extra space by wrapping door or window insulation (the kind with the sticky side, you get at any hardware store) all around the lamp.
- try the new ring. if it's loose, add more, too tight take some out.
your done.

 

you like the ring, but you don't like the commitments . get rid of her ,,, it's like asking your friends . if she's good enough for you to marry

 

well, I took the trim ring back to the store and got another [of the same ] and it fits some better....still a gap but not neer as big....the [not so] funny thing was the parts guy cleaned the one I took back put it back in the package and hung it back up on the wall to sell again...for the next poor sucker to get pissed at.....and to top it off on the way back to the dealer I picked up a nail and had to get the tire fixed while i was there...hell of a day I tell you...i guess if you are going to get a flat it should be at the repair shop...

 

I have installed them on 2 bikes and found with the stock trim ring loosened slightly the crack goes away by retightening it after some miles. It seems that it sort of settles in by the vibration, stretching and forming to fit.

There is a discussion to the problem here:
Say no to Headlight Trim Ring Crack

 

I have the old style rings on all of our bikes with no large gap at the bottom.

As on guy previously suggested, loosen the screw that holds the OEM ring until it is play in it.
Then install the new ring over the OEM ring making sure that it is in behind the OEM ring.
Once this is done, tighten the screw in the OEM ring and then install and tighten the screw and nut in the new ring until the gap fully closes.

Perhaps you had an over sized OEM ring or an undersized new ring?

 

Sounds like a real PITA. Glad I don't have them!

 

As described in an above post, make sure you loosen the stock trim ring and seat the new one under it. As you can see in my pic, the bottom has no gap, but I gave a gap around the light. It bothered me at first, but I just learned to live with it. I really don't even notice it anymore.