40mm fan mount for 540/550 36mm Brushless Inrunner RC motor

I am designing this fan mount for my RC truck. My motor does not get over ~140 degrees Fahrenheit, but I am designing this in case I need it later.
Update - 2014-11-03: New version added with 5mm wide zip tie/cable tie holes and vent holes for hot air to get out.
Should fit any standard 540/550 size motor, I believe they should all be a standard 36mm diameter.