If this is in fact the part, this part is $65 for non stainless and $95 for stainless! Holy smokes! Here's a link that sells them:
http://www.mustangsunlimited.com/Cat...vapor&x=3&y=12
Unfortunately, no pics, so I'm not 100% sure that this is the part. But if it is, shoulda stocked up on those parts back in the early 80s when I started this project!
Thanks for all of the info!