take a look at my other designs https://www.thingiverse.com/mg_evolution/designs
Excuse the dirty pictures of the quad.
I made these for my grasshopper frame. I found the holes were not big enough in the carbon frame to allow the motors to spin once the motor was screwed down. These have space on the outside to attach a thin LED strip.
I have also designed a 1mm spacer without LED attachments.