Window cranks

Thanks for reaching out! Based on the design of your casement operator and the manufacturer number on the arm, I believe you have the 9-1/2" 39-156 Caradco Window Crank and its opposite handed version 39-155. 

To confirm that this operator is correct replacement, carefully compare the dimensions shown below. You'll especially want to confirm the measurement for the short link arm. If the measurement is different, please let confirm your exact dimensions, written out.

Dimensions for 39-156

The compatible cover is part 39-107. If you are looking to replace the handle as well, yours looks a lot like our 39-114. Although, we do have an updated version; part 39-114L (non-folding) and the 39-205 (folding). There is also a folding handle and cover kit; part 39-107FK.