If you are talking about the rubber locks on either side of the rock guard, I would think any Airstream dealer would have or could get them. They are still using them on new models. I replaced mine because they were rusting and leaving rust stains on the surfaces below the locks. I saw stainless steel ones on ebay and bought them. I don't know what the new ones are made out of, but check with a dealer. I couldn't get the nose of my rivet gun to seat flush with the mounting flange due to interference with the rubber lock. I drilled out the pin, mounted the lock and installed the rubber lock with a stainless machine screw and nylock nut.
New England Unit
Metropolitan NY Unit