The rubber plug is the Rain drain.Is it the windshield washer fluid line? That's where mine was in my '86.
You are right.How do you get the covers off the headrests? There's a zipper with no pull on it.
If you go to a fabric-type store and ask for a "zipper dog", they'll give you a WTF?! look. It is called a zipper pull; the two components separately are a pull tab and slider. What you lubricate is the zipper chain (aka teeth). I've been around sewing my whole life and have never heard the term "zipper dog" (sorry, Brian). A sewing machine, however, does use canine-termed components: feed dogs. :beer:It's called a dog. I learned something new. Thanks again
YKK.90% of the worlds zippers are manufactured by YYK in japan.