I'm replacing water pump parts and got a "Sierra" impeller repair kit which matches the parts I took off except for the O-ring. Q1: When I took the water pump off, a chewed up O-ring fell out and I'm not sure where it was. The official Johnson parts diagram (from dealer) shows the O-ring above the impeller cup and below the housing. The one in the kit seems to be too small and I don't see anything to hold it in place. Should I just put in in and hope for the best? Q2: My dealer suggested using OMC gasket sealer where my Clymer manual says to use OMC adhesive M on the large water pump O-ring put into the bottom of the housing. Should I?