Numbers on the part: 20755, 30842R, 40471, pat. #1982
Tom from SWISCO responded:
April 11, 2017
We appreciate you contacting us. Take a look at our 39-155 and 39-156 window cranks. Carefully compare your dimensions to ours especially in the arms portion. We want to make sure that these are compatible to what you have. Get back to us and let us know how you made out with that.