Need replacements for these horizontal crank out porch windows.

There are no markings or labels anywhere on the pieces or windows that I can read or see. The windows are close to 40 years old they are horizontal and there are four window panels to them. I have nine windows that I need to replace the Cranks for they are all wearing out and in bad shape. Hopefully you can find me something that is similar. The Cranks are held in by a screw on the top and the bottom. The picture I sent you the bottom piece that screws in to the window has snapped off.