Running antenna cable from outside into cab using the under cab pass through hole

[brdima]

I want to run an antenna cable from the outside into the cab, using the pass through hole thats under the rear seat (drivers side). But the grommet is hard plastic, and an odd shape, 1”x1 1/4” . I can’t see using the existing plastic cap b/c cutting into it will just crack it or leave a big hole and won’t be water proof any more.

What are folks doing to find a better grommet or waterproofing options? Amazon didn’t seem to carry any rubber gaskets that matched the size I measured. I’m attaching some pictures of what I found under the cab. I’ve seen other ham radio installs here, but they didn’t mention what they did with the gaskets.

 

[PHFT]

I want to run an antenna cable from the outside into the cab, using the pass through hole thats under the rear seat (drivers side). But the grommet is hard plastic, and an odd shape, 1”x1 1/4” . I can’t see using the existing plastic cap b/c cutting into it will just crack it or leave a big hole and won’t be water proof any more.

What are folks doing to find a better grommet or waterproofing options? Amazon didn’t seem to carry any rubber gaskets that matched the size I measured. I’m attaching some pictures of what I found under the cab. I’ve seen other ham radio installs here, but they didn’t mention what they did with the gaskets.

This may be too late but I just ran my cable and used a pry too to pop that plastic bit out from inside the cab, once its removed its actually just a circular hole that a 25.4mm rubber grommet fits in perfectly, I cut an x in it and fed the cable through, tomorrow I will silicone it up.