Need a Part for our Atrium Casement Window

Hello-

Hoping that you can assist me.
Our home has Atrium casement windows installed and a part broke on the locking mechanism. Tried contacting Atrium but have had no success. Found you on the internet and looked through your catalogue and had no success in identifying the part that needs to be replaced. Spoke with one of your representatives this morning and am following their advice to reach out with photos.
The part in question is a heavy plastic bracket that holds the locking bar in place. I have attached photos of the broken part and an intact part.Thanks so much. I realized when you sent your reply, I hadn't given any dimensions. I have attached two additional photos. The bracket has a foot that has it sit 1cm off the side surface of the casement and the screw holes are 1cm on center. (Sorry for the metrics, but those are the most accurate for this piece.) Given that size, the 39-417 bracket you suggested seems to have the screw holes too far apart and even if it were installed with the washers to lift it. Would there be a better size for this replacement?