Airstream still has many of the 80s, 90s and 00s lettering widely available. A member was at Jackson Center, I think it was 2Air and he posted pics of the lettering offered. I seem to recall the pic and seeing at least 20 different types of Airstream decals, lettering and model names.
Contact the factory, they can get you hooked up with the part you need, though they may require you to order it through a dealer.
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91