"leaking" headlight door covers

Damm, I feel for you. obviously you also tried the junk yards, Hook up with one that can also can do a National search for the component you need to replace. Then if that's no help. You might have to do a little bit of your own remanufacturing. ie Diaphragms use in alot of older engine components have always aged and start to leak. If you can tear down the component to the diaphrapm then try a little bit of RTV silcone on the rubber. I say little bit, you'll have to review the part and decide for yourself what will work.