plastic guides for vertical tightening slide bar broken

the plastic guide broke and the bar does not stay in place to lock in the window after cranking it into place. The window type i have is a casement window. I ordered a Right hand lock handle assembly for it in 2010. The part is listed as a NCCASE NEW CASTLE CASEMENT and the part number was 3013232 for that lock handle.

I need the plastic guides that guide the slide bar on the side of the crank handle