Auto locking hubs


I have a 1992 fourtrak with auto locking hubs which do not work. I was thinking of changing them to manual hubs as i can get these at a reasonable price second-hand. Will the manual hubs fit with no problems, I am told there is two different types one with 5 bolts and another with 6 or should I buy brand new auto hubs and is there a place or number I can ring for the best quote.