The part looks very similar to the image pictures at the bottom of this cluster of gaskets called a spool valve filter. http://www.redlinemotive.com/replace...alvefilter.asp

 

so long as I've found the right part, it is part number: W0133-1632779. Via google shopping, it seems this part is ubiquitous... darned jargon/nomenclature... The graphic in the Haynes Repair Manual for the 4cyl displays this exact part.

 

I should have read more carefully, I see which one it is you're looking for now... I will look into that one more as well.