We have a 1976 Avion and are having difficulty finding replacement parts. The skylight lenses are cracked and need replacement - but they are not the standard 14x14 rv vents/lenses everyone sells. Has anyone found a company that helps them specifically with Avion parts? My searches are coming up with nothing. Maybe reliable custom RV companies? Any ideas would be appreciated. The vent/skylight size is 17x17, I believe. We are coming across the same problem with replacing side vents and water tanks...everything is just off enough that Airstream options don't work. Thanks!