I recently got the benefit of fellow Nissan Altima Members: avatar *Sealti96* and *JayJaya29*
This unique valve cover is from the nissan R’nessa, an Asia specific Nissan Wagon produced iirc from 1997 to 2001
Here is the link to the wiki: http://en.wikipedia.org/wiki/Nissan_R%27nessa
The R’nessa has a fwd and awd setup, resulting in a transverse engine mount within the chassis. This means that the Valve cover is only applicable to transverse mount KA24DE engines like the one in the Nissan Altima.
Rest assured that I have a LOT of updates coming in the New Year so stay tuned.