Take the plastic cover off on the inside of the door .There should be a Phillips screw holding it on. Then remove a piece of foam rubber. This should expose three 10 mm nuts holding the mirror on. remove mirror . Reverse to re install
they did not come with one dummy
if you know what you are doing, a day.
Almost all body parts from a 94 will fit on a 91.
yes
Yes
Yes, the front ends should be identical.
Yes. The sc1 is a coupe.
If you are seeing fluid in the mirror, or it appears to be leaking, then it wasn't a flooded car. There is a special chemical inside the mirror that causes it to get darker so you aren't blinded by headlights behind you at night. You are going to have to replace the mirror completely, or ignore it.
Dealer or junkyard for stock replacement Parts store for aftermarket ones
the quad driver is a individual circuit within the PCM. you will need to replace the engine computer (PCM) in order to correct this issue.
For the M coupe: http://www.zroadster.net/forum/viewtopic.php?t=23387 For the Roadster: http://www.zroadster.net/forum/viewtopic.php?t=16269
It is on the driver side, behind headlight.