I think you may be referring to the segment protector connection assembly. My apologies if your problem is in fact the window glass rock protector.
Airstream abandoned the Deutz type grommet connector several years ago.
See post #16 of the thread below for an address to Out of Doors Mart for a decent replacement guide. Note that Inland RV will also carry all of the parts necessary for the new connection assembly.
Good luck on the much more robust fix.
Thanks to Inland Andy for sharing his considerable knowledge here on the Forum.