Any compentent stereo shop can do the full install for you. However, they
need to know hot to take that radio out.
Pull out the ashtray... pull out the ashtray insert, remove two screws...
Put parking brake on... shift gear to back... then pull out entire ashtray
unit out. From here, they can do all the work for you.
You can simply just replace the radio. Make sure they get the polarity of
the speaker right... if wrong, would sound bassy and no treble... if right,
you can hear the treble.