Using the Cobra chassis with an existing circuit board?  You'll need a good way to mount that PCB!  This PCB Mounting Kit makes easy work of boards with different hole layouts. 

Specs:
Material: 1/16" thick garolite
Accomodates hole spacing from 12.7x25.4mm up to 82.55x76.2mm (0.5x1" up to 3.25x3").
Weight: 5grams (0.17oz)

Includes:
4x PCB Mounting Slots
4x Nylon 4-40x0.25" Standoffs
4x 4-40 Nuts
4x 4-40x0.25" Screws

Note: 4-40 Screws require a 1/16" Hex wrench.