Replacement Window Cranks, left and right.

Thanks for posting. This really depends on what kind of Pella casement operators you have. That will determine what might work for them; not all Pella accessories will work with every Pella operator. Can you show us a photo of your existing operator in its entirety: the crank handle, body, and link arm(s) that push and pull the window closed? One overhead picture, with either the operator removed from the window or at least with the window open for a clear view, is best. From there we'll do our best to ID what might work for you.