You can buy HU mounting kits all over the place. Just check with your local stereo shop, if they don't have it, they can get it. I have seen them all over the place. I think it's a 1-1/2 DIN size HU for the focus but don't quote me on that. If that is the case, you might have to go get a double DIN mounting kit and do some custom work to get it to fit.....