Crank for kitchen window.

The crank out for my kitchen window has broken. I was able to find a sticker with the following information:

Product ID 7501 / S.O. 19650521.1 / P.O. Lynch

Actual Size 31 3/4 x 37 1/4 / Silverline 8002344228 / MWHS 4

IGCC/IGMA 02-11

The crank handle has broken but the window still cranks out, I would like to replace the entire part not just the broken handle. I did not see a product name on the tag only the information above. I'm hoping I have the right vendor. 

Thank You

David 

In responce to your reply, I have attached several pictures of the arms as best I can. Technically i just need the crank handle itself but I would prefer to replace the entire mechanism if possible. The handle broke because it hung up at some point and my son kept trying to crank it until it broke. It seems to crank in and out fine now.

Thank You

Dave