Door Lock Cylinder Gasket Availability

[badpeanut]

I had the lock cylinders out of my doors tonight and the gaskets crumbled. Does GM have these and if so what is the GM part number (my parts guy is lazy and often won't look stuff like this up)? Do any of the auto parts stores have these?

I see they are cheap in the restoration catalogs, but this is all I need at the moment so shipping makes them expensive and I'd like to pick some up locally ASAP.