Replacing the hinge and arms.

Thanks for reaching out to us! This window operator reminds me of the 39-253RB Encore Dual Arm Operator. Although, to determine if this is the correct replacement, you'll need to carefully review the specifications and the compatible hardware.

This operator uses the 39-529 Truth Hardware Track Slider, which slides in the 39-528 track. The compatible covers are the 39-376 (folding) and 39-452 cover and handle kits.

The opposite versions of the operator and covers can be found tagged below.

Dimensions for 39-253RB