I need to get a left and right crank for the window shown.

Thanks for you post! This window operator is a match for the 39-253LB Encore Dual Arm Operator. The right handed version is the 39-253RB. It does not come with the cover attached, like yours, so you'll also need either the 39-375 (folding) or 39-451 handle and cover kits.

The other compatible hardware and accessories can be found tagged below this thread.

Dimensions for 39-253LB