Casement window operator

Hello,

I can't be sure with the operator still installed but the 39-013 would be a good place to start. This assembly is used with the 39-114L and folding 39-205 handles. We also offer the 39-014 opposite-handed version if needed. Take a look and see how the specifications below compare to yours, paying close attention to the length of the arm. Thank you! 

Dimensions for 39-013

Additional information for 39-013

Detail of 39-013