Yep, that's the Earl's number I've been posting.  

 

I searched my files (cardboard box) over the weekend and found the receipt for the fitting I used.  It came from www.anplumbing.com.   

It looked like the one in the link I gave earlier. 

 

For the record, I did say that I didn't remember what it looked like :-)   The anplubing site was the one that I was referring to earlier, when I mentioned that there was a site that used to sell these filters with fittings.  They don't show that option anymore btw.

 

Anyway, I'm glad you got to the bottom of this.  I was just about ready to order another fitting just to see what it looked like, so you saved me the trouble.

 

Cheers,

Rusty (searching for Earl's cowl extenders)