I've mounted them in the glove box, leaving the OE in the original spot. Are you just trying to maintain the original condition, or keep the thieves away...or both? With the quality of factory equipment these days, head units aren't as much of a comodity for thieves as they were just 5 years ago. Aaaand for that particular vehicle, it'd be almost easier to take the whole car than tearing the radio out of the dash.