Are you talking about the rounded face, and a stock header unit? I have a ZX2 and the header was simple to replace. You should see 4 holes around where the factory player is (two on either side). You need to go to your local auto parts store, and buy a ford oem radio removal tool (its literally two U shaped wires). You just push the tool in on both sides, and pull outwards (that is, pull the left tool towards the left door, and the right tool towards the right). After doing that, the radio should slip out.
I didn't take the photo below (i googled it), but its similar to what mine looks like.
Linear Mode
