Since most parts of an Airstream, or any other trailer for that matter, except the body and frame, are common throught out the industry, parts are readily available. Things like lights are can be a problem. I'm amazed that Airstream will fix older trailers at the factory, auto makers won't do that, and genuine oem parts get scarce for older cars and such. There really isn't much of a market for doors and cabinets for
1968 travel trailers, only truly hardcore owner, such as those found on these forums, will make extensive restorations of 20 year old trailers. After a point, its thank God for the internet.