Storm Door Glass and Screen Retainers

Need help in sourcing the brass clips that are used to retain the removable storms and screens in wooden screen doors. They’re brass and about the size of a half-dollar. They’re circular with one straight side. They work by turning the circular part into a slot in the window or screen….anyone?
Replies
Crown City Hardware. They may not have them on their website, but they are in their catalog.
http://www.crowncityhardware.com/index.html