Go on Ebay, search for Campy 8 speed derailleurs, and pick one in your price range.
Rank: Chorus, Centaur, Mirage bottom. Wasn't Euclid mtn bike ?
Do you need a shiftmate to work with trigger shifters ? Or hoping that the Campy derailleur just happens to match cable pull for Shimano shifters and cassette ?
Last edited by Homebrew01; 01-29-16 at 02:52 AM.