Looks like these are still available from GM if you wish to go that route.
http://www.gmpartscenter.net/auto-parts ... r=88970748
Not sure what all you need, but there are 3 different parts (16/17/18 in the link above.) There's the grommet in the fender, the prop rod itself, and a clip to secure the prop rod when not in use.
Welcome, by the way!