I've got this fuel drain located on the inner fuselage that is missing a grommet on the passenger side. The hole where the grommet is missing goes through to the floor by the passengers feet making it extra cold this time of year. I've tried to locate the part number to replace it in the parts catalog but it is difficult to visualize where this is on the parts catalog. What is the best place to find a part number for this grommet? Also, upon finding the grommet part, is there anything special about installing it like heating the rubber to fit it over the drain side posts?