Operators are shot and broken can you replace?

I have some old BiltBest Casement Windows. Operators are shot and broken, most are wore out or broken. Stamping # P234 DC # P233 DC on parts. I want to be sure and others have me looking at 39-139 Single Arm Crank Operators - and say: Let me know if you think that will work?? How would I know? You guys are the BiltBest Window Pros - can you help?

SURE WE CAN .. and Thank You!  Find a group of FAQ'S here: http://www.biltbestwindowparts.com/search/node/P233

FIND THE PARTS HERE:  http://www.biltbestwindowparts.com/content/casement-operator-0