Hurd window crank accessories

I need to replace what appears to be an awning style part not 39-037 whole window parts including the screw out/in mechanism with a center drive. the armatures are approximately 6" long for each of the scissor parts. The part listed above is for a 13 1/8" so it may not be the correct replacement number. Please advise if there is more info needed from my end. the color of the handles is white.