No one repops them, NOS are unobtanium, and finding a set from a salvage yard that is in good condition is very hard. Even Murray Park, the C-body Mecca for slavage cars will tell you he doesn't have a decent one out in his yard.
A 1/2 decent work-a-round to the problem has been done by a Kip, amember of:
http://autos.groups.yahoo.com/group/NewYorkerOnline/So far, it's the only solution that we have come up with.
And many have tried.
We've been trying to get them made for years but nobody's interested.