You could look for originals in a salvage yard, but they will most likely be as bad as your originals. After so many years and hot/cold cycles the plastic gets brittle and useless.
If you can bear to depart from the stock look you could find replacements in most major auto parts stores in the red bubble pack Help line. They may even be close enough to stock that no one would really notice.
I have taken some liberties with the vacuum hose routing on my 1990 LE and eliminated some of the rigid hoses replacing them with slightly longer rubber or rigid fittings pirated from other cars. But then, I don't really care what it looks like as long as I keep getting 36 mpg.