This might be of use to you. Download the Service Manual from :
http://carfiche.com/emanualz/2003_350Z_FSM.zip
It's for an '03 but the mirror and wiring should be the same for the 04s, 05s, etc.
Look in section "I Body" then "GW Glasses, Windows and Mirrors" around page 57 for the inside mirror. It has a wiring diagram and shows how it's mounted to the windshield.
Dave
http://carfiche.com/emanualz/2003_350Z_FSM.zip
It's for an '03 but the mirror and wiring should be the same for the 04s, 05s, etc.
Look in section "I Body" then "GW Glasses, Windows and Mirrors" around page 57 for the inside mirror. It has a wiring diagram and shows how it's mounted to the windshield.
Dave