I designed this flashlight holder to carry 7 flashlights of 14500 (AA) or 16340 (CR123) size. You can mount the rails as close or far apart as you need for the length of your lights. The limiting factor on this design is the greater of the emitter-end or tail-end diameters. This holder will accept lights with a maximum diameter of 25mm (31/32").
I have a smaller version posted here that's great for 10440 (AAA).
I'm on a mission to store things vertically and take up less shelf space. Maybe this can help you too! Happy making.