Casement window part

Hi ... we have crank casement windows in our townhome. Previously you guys identified new cranks and handles for our windows (which were perfect). Now on our 2nd floor windows the black piece that Roto Single Arm Operator, 13-1/2" (right and left) snaps into on the window has broken.

I have enclosed photos of this part ... the # on the part is OP 051002. I slides into a track on the bottom of the window itself. It measures approximately 7/8" x 5/8". Please let me know if this can be replaced.