Sadly Sport Z Magazine is no more.

Here's links to what you may be looking for:

The ZFilms/Nissan Sport Mag page which has the archive of old SportZ videos: http://www.zfilms.org/NissSportMag
 
The old SportZ web site:  www.SportZMag.com
 
The new Nissan Sport Magazine web site:  www.NissanSportMag.com
 
Or just go to the root ZFilms page and root around for what you're looking for:  www.ZFilms.org