Radion Bracket Spacing

[pumarjr]

I had seen a members tank here with two ET Radion's over a 36" tank. My fixtures should be here on Thursday and i'd like to have to brackets made already, can anyone that has this setup post here on the length of stock aluminum and how far in on each side to drill? Also, the thread size used in the fixture?
thx in advance for any help.

 

[STL]

Radion support has a diagram:

What are the dimensions between the mounting holes on the Radion XR30w?

IIRC, the screws are M5 (metric).

As for spacing between the radions, each lights a 2'x2' region very well, so you'll have some overlap between the fixtures with a 3' tank.