find some old lady with an olds, and steal it. Used to be that the local auto parts store had a little plastic bin box with lots of those weird grommets in it, did you try that?
Man, oh, man Google is fast. Did a quick search and THIS thread came up first. I wonder if a plain round one were flexible enough if it would just comply to the dee shape??? Or check page 1-48 of this for the factory numbers and go from there? http://wildaboutcarsonline.com/memb...ts_Numbers_1966-75_Group_1.00_Cooling-Oil.pdf
I think i have a few croucho if not i wil steal one ffrom a cover i have. Alos try ames in NH they have alot of that stufff for pontiac olds. I`ll let ya know asap
My local guy's working on it now. The one he ordered won't be in til this afternoon. I had the plain round one in it. It leaks pretty bad out the 2 corners of the "D" shape
He wins! http://www.fusick.com/starfire_rubber_parts.htm Scroll down the page it looks like they have the right pieces for both sides.
this guy is on E-bay has both sides NOS AC Delco oplus@verizon.net . or search olds valve cover grommet.
Groucho: It's either a P.C.V grommet or the breather grommet for the air cleaner. I'm pretty sure I have the "D" shaped gromment for the breather in my stash. PM me if you can't find it locally. Steve