Specter Off-Road
http://www.sor.com
http://www.sor.com/sor/cat047.tam?uu=2633582 - about half way down the page.
Failure and cracking is pretty common on those. I wouldn't waste my time with a used one, especially since even good ones rarely survive removal intact.
Edit: Specter DOES sell the right part for your 80.
Part #047-02L-U is a slightly used one (used for "testing", whatever that is), $40.00, in stock
Part #047-02M is new, and has to be special ordered. $72.78
Part #047-02M-U is used, in stock. $30.00
Edit again:
Click here and go to the bottom of the table -
http://tinyurl.com/egrpipe