Designed to be used a PCI-E extension cable: https://www.amazon.com/gp/product/B008BZBFTG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Made these to mount a video card externally, the rear mount is quick release, front uses a nut/bolt to hold the video card down. Each tower uses 2 bolts to mount to surface. Intention is to be used with a PCI-E extender cable. I've also uploaded generic PSU mounting brackets.

The template "should" be scaled properly, print with 100%/original scale.