You can fix it yourself, go to one of the on-line suppliers that sell Airstream parts. The part you need is called a "Zues fastener" they ar commently used in light airplanes.
http://airstreamsupply.com/New-Airst...ent-protectors
Scroll down on that page to:
RUBBER RECEPTACLE, #82-35-306-10 STONEGUARD/WRAP PROTECTOR
Rubber Receptacle, #82-35-306-10 Airstream Rockguard
Turn fastener stud
Turn fastener stud for Airstream Rock Guard ..
Get both parts, they are easy to install....
Good luck,
Larry