That piece is a gutter spout, and doesn't hold the awning. There should be a set screw in the rail that holds the fabric. Jyrocharlie found a source for replacements - I wanted to replace one of mine, but couldn't find one anywhere. Kinda pricy plastic at $10 per, but whatcha gonna do?
Bob - Folsom CA
2008 Fleetwood Southwind 35A, Workhorse W-22 8.1
Acme EZE Tow Dolly - 2007 Honda Odyssey