This panel fits into the radiator mounting slots of the Thermaltake Core P5. I have a 3 fan radiator and the panel fits perfectly in the leftover space above the radiator. You may have to play with the stl a little if you use a different sized radiator. The panel will "press fit" into the slots on the Core P5 case. Its a tight fit, so you shouldn't worry about it falling out, in fact it may be difficult to remove once its fit into place :) The temp display is also "press fit" into the panel.
I purchased the temperature display from amazon. Follow the link below.