adam, don't the latest kenwood masks have the 'face' (if you can call it that) and the unit matched so you can't use a different face on the old head unit. I think I read that somewhere.
Another way to keep your headunit is to get some of that twisted metal like rope (the ones laptops use. pcworld sells it) and bolt 1 end to your headunit using the thread on the back pivot it 90? on the bulkhead behind the headunit and ancor it to the floor with a padlock. The downside is they'll more than likely fsck the dash surround up trying and hopefully failing to take the headunit out which won't budge. But at least you keep the stereo.
2 ways to look at it:
1) ?300+ of stereo lost forever
2) ?10 ish dash surround fscked and replaced from scrappy
I know which I prefer.
Locking cages that all headunits have now are useless. halfords and other stereo shops sell replacement keys
or anyone that's bought a kenwood headunit has a set of keys to steal another
