Is this what you are after? http://www.ebay.com/itm/1951-54-Chevy-and-GM-Trucks-Vent-Window-Pivots-/352109730133?hash=item51fb601955:g:7zAAAOSwUKxYblhd&vxp=mtr
At least it gives you an idea to fabricate one if you can't buy these.
Click

Last edited by Greg_H; 08/14/2017 12:15 AM.