One of the better picks I found while trying to figure this out:
http://www.osoiworks.com/v3/ow...V.jpg
see the black plug by the firewall . That is a series II. On the series one, you would have an ignitor bolted into those two screw holes on the spark plug cover.
Pretty lame that Nissan couldn't have made a different cover for the series II that didn't have those screw holes.