Hi, I am new to this board, I am hoping someone can help me. I have a 1976 Mercury 9.8 long shaft outboard. My lower unit is toast so i was wondering what other years up or down in years would fit. Can a short shaft be used just by changing the mid section? Would a 7.5hp be the same? Someone has a late 60's long shaft lower unit from a 110(9.8) thats in pretty good shape, would that work? Please if anyone with knowledge of these lower units can tell me what I can use then I would know what to look for. Thankyou.