Looking for a window replacement part

I have Simonton windows in my home. There is this piece that is used to stop the window from being open all the way up. If you push the button once it partially goes in and then you can open the he window up further. The piece was not pushed in, someone tried to open the window to hard and it broke this piece. There is once on each side of the window so I am looking for two parts. Can you help?