As part of my 1998 Boxster Renovation, I am installing newer 997 Mirrors instead of the standard 986 ones.
Renovation:
1998 Boxster Project - Complete Restoration
Here are some basic instructions for the project. I purchased my mirror housings from Xtreme Motorcars.
Disassembly
This is the 986 Driver Side Mirror with the glass removed. To remove it, you need to pry it off with your fingers. It will pop out.
On the inside of the mirror mount, you will remove the foam backing. Then remove the two screws holding the black plastic to the metal frame. And remove the two screws holding the wiring harness to the metal frame.
The mirror motor needs to be removed. There are three long screws inside the motor next to the white plastic bar that need to be removed. There are also three screws holding the metal frame to the mirror housing. Remove them.
Unplug the mirror motor and set aside.
You will need to remove the wires from the plug. Mark the plug so you know how to put the wires back.
Once the plug is removed, pull the wiring harness out and set aside.
Remove the black plastic bottom from the metal housing. I am pointing to the clips holding it in place.