Awning window difference with Barton Kramer 228

Thanks for posting! Your operator looks similar to a few different awning box-style operators we have. To narrow down the best possible replacement, I'll need to see "front-profile" view of the installation hole placements on the operator. 

Please let me know if you have any questions in the meantime.

Thanks for the photos. It does not seem we have an exact replacement match for your existing operator, but take a look over the diagram for the right hand 39-084; the left hand version is the 39-085. 

Carefully compare the dimensions to determine if this could possibly work for your repairs.

Alternate view of 39-084

Dimensions for 39-084