See post 4 in this thread for GM part numbers.
http://67-72chevytrucks.com/vboard/s...d.php?t=115346
The link to the vendor where I got my GM grommet a couple years ago is below. The grommets are near the bottom of the page with the GM part numbers. Give him a call and find out if they are still GM issue.
http://67-72chevytrucks.com/vboard/s...d.php?t=115346