Mitch - I'm not real familiar with the 855, but I presume that the alternator, from past history, is a Delco system. If it is a Delco, you can go to your local automotive store and with the old alternator you can compare to 76-78 GM alternators. Should be about 49.95 with a life time warranty. If not an exact copy - should be easily wired in to your system. The mounting bracket would be the biggest problem to modify. I've been there and done that several times. the only thing is that the newer rebuilts are 55 amp units, and you may have to increase the wire size from the alternator battery terminal up through the ampmeter and back down to the starter battery connection. Piece of cake! Hope this helps - Yugo