I would like to hold onto the extra just in case, however, if you look in this thread.
http://saleenforums.soec.org/showthread.php?t=21633.
It has all the info on the grommet The maker is Kennard industries. I would give them a ring.
If you come to a dead end, I would rethink letting the grommet go. Since alot of the PJ parts are no longer made many including me try to have one extra of certain pieces. Their really hard to come by and sometimes they are priced $$$$$$.
I'm betting you can find the grommet online.