It is
SUPER easy.
As long as you have the plug connector that plugs into the back of the mirror.
I have one installed from my mom's 1998 Mercury Grand Marquis that was totaled.
Almost ALL of the auto dimming mirrors used in cars are from the same two brands, just modified with respect to color of compass/temperature (if it has those options).
The two brands are Gentex & Donnelly. (Infiniti, Ford, Lexus, Jeep, etc, are just a few of the companies that use Gentex. Ford and Jeep use that bluish green color for a compass/temp. Infiniti uses a redish color for compass/temp)
Here is a great site with info on these auto dimming mirrors.
http://www.cherokeetalk.com/forum/f64/x ... tall-5810/