You don't have to take anything off the front. Remove the radio, reach up behind and undo the three screws and it pulls out the back.
The Three screws, are they access from the front or behind the clock?
I hear some people take the clock out from the front, other say from the behind, but I have to think the screws that hold the clock in place must be the three same screws whether you are coming in from the front or the back, correct?
Hoping that makes sense.
SB