If you want OEM Fuel Filter Manager gaskets the part numbers are: 12511959 for the water in fuel sensor ($1.29) and 12511962 ($5.58) for the one on the bottom. I ordered mine from the local stealership. Took a couple of days to get them. I think the total with tax was around $14.
My 94 did the same thing.. the o-ring for the fuel heater on the FFM was leaking. The fuel was coming out of the wheep hole in the bell housing. $14 fix from dealer
I put mine in the pressure test port (left hand/driver side) plugged with a brass plug.. many opinios out there on this.. might not be the best but it works for me. (and it just screwed right in)