There is a plastic/rubber plug that is on the floor right behind the Drivers rear seat bolt under the carpet, you can see the plug under the truck. I think it is a drain plug of some sort? :dunno: Anyways I ran mine right through the center of that plug and put some RTV around it to seal it up. The plug acts as a grommet to keep the cable off the metal and seals up nice. then I just ran it under the carpet to my CB. Unless it is just an '88 thing, it works pretty well.