The one thing you'll most likely need is a wiring harness between the
radio and the Ford connector for compatability.  They cost about $15 at
auto stores or other electronics venues (Best Buy, Circuit City, local
car stereo stores).

You may also need a kit depending on the size of the opening for the new
radio itself.

I installed a JVC standard-sized DIN chassis CD receiver into my 2000
Mustang without the need for a kit, but I rewired the speakers and
bypassed the internal amp and harness with molex connectors, something
not recommended for a novice to do...this makes it easier for me to
change my radio out later.

I think 95 and up use the same harness, so as long as the unit will fit the
dash... you should be good.