"Vent stop"? identification

To Whom It May Concern:
 
I think I am trying to find replacement "vent stops" for my ca. 2004 vinyl replacement windows.  The hole the vent stop sits in appears to be 1-1/16" tall by 3/16" wide.  Attached are a few pictures of the item and a label I found on the window itself.  Unfortunately the company that manufactured the windows and the installers themselves are both out of business, I tried there first.
 
If there is a part you sell to replace these stops then I'll need 40 of them in white.
Thank you