When the vandals broke through my window, they broke 2 of these. Going by eye they're about 3/8" diameter and just over 1/2" long.
I don't think they're worth $15 shipping. But if someone has a couple laying around that they'll never use, I'll send you a SASE so it won't cost anything.
Otherwise I'll take a look around next time I have to go to the junkyard and maybe I'll get lucky and find a couple.
It's not really a big deal, the curtain stays up, but I would like to fix them sometime.