Replacement parts

Our windows have cracked and broken spring covers on the sides of the casements. Some have broken, fallen into the bottom, and caused the windows not to open. Please advise if you have equivalent replacement options. I have enclosed a picture of the Simonton tag. I am unable to remove the part. It is spring loaded and recoils into the window casing when I try. Here is a picture that reveals more of the interior as well as a picture from where the part was removed.

Thanks,

Jason