Originally Posted by
WheresWaldo
Something more like this? It places each mount about as low as it can go and still leave ample material around the mounting holes. The mounts are 40 mm center to center right smack in the middle of the 80 mm center to center mounting holes, per your sketch.
By the way, the FLY6ce mount will accept an Apple AirTag in the rear.
Cool, looks like that's it, if the dimension below is roughly correct. This will allow the Cygolite and the Fly6 to be aligned and both below the top of the rack.