I've got a 606A and these:
The 606A fits the Fenix well, but the mount does take up a lot of barspace.
This one is much too large.
Pivot pins and centrebolt were rusty, didn't seem well made, I threw it away so can't check the fit.
My favourite for the 606A is this one:
Universal Bicycle Mount
Most of the mounts are too large for the 606A, but this one fits well with a little bit of tape around the torch. Sideways adjust is a little bit slack but can be tightened - it's a self tapping screw, after experimenting and taking it apart a few times I replaced the screw with a nut and bolt.