Please Help finding the right part

Thanks for your post! The operator you have here reminds me of either the 39-031 EntryGard Dual Arm Operator or the 39-155 Caradco Window Crank. To determine which of these is the correct replacement,  you'll need to carefully compare the dimensions below; especially the link arms.

You'll find the opposite versions of these operators tagged below, along with the compatible hardware and accessories.

Dimensions for 39-031

Dimensions for 39-155