The inner dimensions of the quadrat with a screw head as center in mind are 80 x 72 mm and the outter dimensions are 91 x 83mm.
It does not fit any common fan size.
So you would basically have to drill the holes that will fit the mounitng brackets, if its not any standard dimension, right ?
You could always offer a plate that would fit a 120 or 140 mm mount that has the holes that would fit its mounting mechanism. THis plate would then go in the mounting holes of 120, 140mm fans, and then thorugh this mounting plate you could attach the pump/reservoir combo !
One could of course do said plate thorugh a custom firma, like
Emachinesshop !
Something to think of in the future, most definitely.
Cause i was planing 2 loops, with 2 pumps per loop, one attached to the radiator, one attached to the reservoir, for each loop.
They would run in serial.
And i was thinking on attaching a rgb led to the reservoir and control it based on loop temperature, for each loop, but alas, as you said, only one rgb connector is allowed for the aquaero 6 xt, and there is no other way a second could be connected.