Need a dimension of the Hydra 64HD mounting bracket. anyone help?

[reef tank 2.0]

I am looking into one of two mounting options for the AI Hydra 64HD fixture (just one).
It's either going to be the single fixture mounting arm that secures to the glass of the tank, inside the overflow.
or
the track that will rest on the edges of the glass

since i will have one fixture, i'd really prefer the single fixture mounting arm

i can't find a dimension of the mounting bracket that goes inside the overflow area (the back glass facing the inside of the tank). Looking for overall dimensions of this bracket once fixed into place.

I don't have a lot of room in that overflow to secure the bracket into place a they show in the instructions / videos that I've seen online.

Does anyone know if that mounting bracket can be turned 180 degrees so that the tightening nut / screw is facing away from the tank, on the back side?
Can anyone provide a dimension of this clamp so that I can see how far it sticks out?

HMS Single Light Mount Kit

Redesigned and Stronger Than Ever! The HMS Single Arm Mounting Kit is perfect for tanks that only need a single Hydra LED unit, or if you want to have multiple units without a rail running across your tank. The kit comes with mounting brackets for the 32 and 64 series of LED lights that can...

www.bulkreefsupply.com

 

[Reefing Madness]

 

[reef tank 2.0]

no need to respond, I think I am going to go the Kessil (2) 360X TB route. i'll mount one on each side of the overflow and call it good.