Audio Systems: remove stero faceplate, four holes, removal tools

Question
I have a 1999 f150 extended cab.  I want to remove the old stero unit and replace it.  what do I need to do to remove the faceplate.  There are four holes that look like you insert some kind of device to pull the unit out.

Answer
http://www.installer.com/tools/

http://installdr.com/InstallDocs/FLM/PDF/356017.pdf

The first URL above shows the removal tools that you can purchase if you need.

The second URL give pictures and instructions on how to remove the radio.  It also explains that you can make the removal tools from coathangers.

Good Luck!
Cleggsan