I like using Noctua fans .. they're quiet .. they play nice with PWM, and generally seem decent quality :) .. Unfortunately they sometimes have odd sizes ..
Especially the 60mm fan, which is 25mm deep ..
The default skirts would have that push inside the electronics bay .. which is not bad in many cases ..
But I wanted to use the excellent Inverted EMS System by @FizzyTech which kind required there not to be fans sticking into the inside of the frame.
I came across the excellent and much more sturdy then the original side mount mod by EraserFX, but it too still made the fans stick inwards. So I inverted it and cleaned it up a little.
The author remixed this model.
This is a remix of the skirt fan mount to have any excess fan stick to the OUTSIDE of the frame.