CatEye TL-1100
Requires the US standard of two vertical holes. They even include the screw in the box. You can recycle all the other mounts in there.
TIP: The screw is self-tapping. Screw it in before mounting to tap the threads. Then unscrew and mount.
Originally Posted by
mechBgon
Also note on the LD1100 that if the rack's metal mount is really thin, the self-tapping bolt can go into the light far enough to put a bulge in the battery compartment, as I found out the hard way on my LD1000 when the batteries wouldn't come out anymore

You can use a washer under the head of the bolt to prevent that, if necessary.
What these guys said but with pictures

.
I used a shortened screw and some sealant to keep it in place. (I punctured my battery case too

)