Remove the inside door panel. Remove the wiring harness. Remove the mirror retaining bolts. The side rear view mirror will come off.
Chainsaw
Ford dealer parts department. Auto salvage (junk) yard. You can also buy after-market replacement rear-view mirrors at most well equipped auto supply stores. 1aauto.com Carries them too for this vehicle. http://www.1aauto.com/1A/Mirrors/Ford/Focus/-/-/2001
The 2004 Ford Focus has 53.5 in. of rear shoulder room.
The 2006 Ford Focus has 47.9 in. of rear hip room.
The 2014 Ford Focus has 33.2 in. of rear leg room.
The 2001 Ford Focus has 37.6 in. of rear leg room.
The 2014 Ford Focus has 38.0 in. of rear head room.
The 2013 Ford Focus has 33.2 in. of rear leg room.
The 2004 Ford Focus has 38.7 in. of rear head room.
The 2003 Ford Focus has 53.5 in. of rear shoulder room.
The 2005 Ford Focus has 38.6 in. of rear head room.
The 2003 Ford Focus has 37.6 in. of rear leg room.