1. Just the mirror. LH Side Mirror Part# 963661MA0A
Instructions:
1. Place the glass mirror upward.
2. Apply a strip of protective tape (B) on housing assembly.
3. As shown in the figure below, insert a small flat-bladed screwdriver (A) between glass mirror (1) and actuator (2). Push up both pawls simultaneously to remove glass mirror lower half side.
4. Remove both terminals (A) of mirror heater attachment from door mirror (1).
5. Install in reverse order.
2. I would assume by laying the trunk and looking up at it you could find the wiring. But you may have already tried this. If the wiring is not available in the trunk you will most likely need to remove the rear deck cover, or "Parcel Shelf" as Nissan calls it, which does not appear to be the fastest process.