Hey guys, just wondering if anyone knew much about the Ford double din head units you find in focus/mondeos around the 2008 model age?

My head unit has packed up, it has all the sat nav functions running through it as well so the car is pretty screwed without it! Tried a different head unit in & it works, but can't seem to find a decent replacement for this one... Any suggestions of what is compatible with the cars sat nav etc?