Replacement GPS Belt clip mount

Who knows where these things get to? This is a replacement auxiliary mount post for a common brand of GPS, similar to:
http://www.amazon.com/Garmin-Belt-Screw-Attachment-60CSx/dp/B000MM6SRK
and that goes with one of these clips:
https://www.gpscity.com/garmin-belt-clip-holder.html

The little screw appears to be 4-40 thread.