Hello Dances With Flashlight, the best ready made option that I have seen would be the TEC Accessories P-7 Clip from Lighthound and or J.S Burly's. I do have a large quantity of Brass sheets laying around and I have wanted to try making a clip but have yet to find the time but I believe that most Peak bodies have enough material on them to drill and tap holes for a clip. Not sure how durable a brass clip would be but it would look very nice. The only other option that I would go for would be a McGizmo Clip but that would need to be installed on a CR123A body and that may take a little coaxing to get the clip to conform to the body. Battery Junction has some clips for their Nitecore flashlights that may work as well but it all depends on how much tweaking of the material that can be accomplished without comprimising the holding power of the clip and that's why I like the TEC P-7 option with a McGizmo Jewel clip of your preferred size.