Re: water inlet tube came out with lower gear housing
to separate the lower from the upper, the water tube and guide must be separated. no other way to do it. for a first impeller change. a new water pump housing replacement is a good idea. water pump base too perhaps.
I may need o replace the gromet that the inlet tube goes into
i'm concerned about this statement though. hopefully your referring to the water pump. if your referring to the water pocket cover that the tube engages in, in the upper. be very careful about removing it. while only 4 bolts hold it in place and they are easy to get to. many times, one or more of these bolts can break off during disassembley . don't break them off. if you do and can't get the broke studs out you'll be replacing the upper drive.
also, you may want to get the service manual from the adults only sticky at the top of the i/o forum. that way you'll know the proper procedures for service and also be able to call the parts by their correct name so folks understand what your commenting on.
edit, guess the s/m's are gone forever... watch ebay or the likes to get the s/m ya need... if your not sure which s/m ya need, let us know what year 120/alpha1 and someone will let ya in on which one... alpha1 is for sure s/m #6... if it's an alpha1..