Millard casement window parts needed

This operator can be replaced with the 39-253LB Encore Dual Arm operator. It has the 39-529 track slider, at the end of the longer arm, which slides along the 39-528 track. The cover does not appear to be removeable, so you'll also likely need to purchase the 39-451, another option is the 39-375 folding kit.

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

Dimensions for 39-253LB