Can't help you with the seals except to say to Google "Out Doors Mart" and go to parts. They have some part pics and some helpful videos that might help.
Then I also wanted to say that I like your name, "Desperado", I'm surprised that it was never used on here before.
Welcome to the forum.
Just start Emailing ALL the AS dealers.
My best luck finding Squarestream parts have been
(1) Camper Repair Center.Montevallo AL.35115.Phone 205-665-2531
(2) Oasis RV Center inc.Tucson AZ.520-889-6361.
__________________
Live every day as if it is your last one and one day your going to be right.
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.