My '88 C4 looked pretty snappy except for the ratty door window seals. They
were brittle and broken. I ordered a pair of replacements from Zip Corvette
It was money well spent! It took me about an hour or so to change them out
and it makes the car look years newer.
Here's an after pic:
$80. (including shipping) and they fit just like new.
ps. CorvetteMagazine has a "How To" page on the process: