window crank operator replacement

hi, we have these old pella windows with a lot of broken cranks. however I found out one of them was replaced with a much better and simpler design. i took that off and am sending you the pics of the one I want. its a simple crank that moves a straight arm, and at the end of the arm is a little plastic slider that slides inside a track that is attached to the bottom of the window.
really simple concept: crank->straight arm->slides in track at bottom of window to open and close 
if you have anything that will work like that let me know. Thank you!