[Rick Parker]

Chrysler used a screw in ball joint years ago...just a thought.
Get friendly with auto parts wholsale distributor. See if the will give you (there's a thought) a Moog Suspension Parts catalogue
it should have what you are looking for. Many of the catalogues
are now on a CD rom. What you'll want is a book type. This has helped me sort out needed items for various types of thermocouplers, and miscellaneous electrical switches etc.
A stock car chassis builder may be an asset as well.
Just a word of caution watch the taper on the ball joint itself.
Good luck