I have a vinyl replacement window that has a broken metal bracket or "pin" that hooks into the spring mechanism at the side of the window to keep the window open. The Bracket or "pin" can be removed with a screw driver from the bottom of the window. Does anyone know where I can get these replacement parts, so I can put in a new bracket so that my window will stay open on its own?

They have all kinds of replacement parts.

http://www.allaboutdoors.com/