Simonton Window Hardware Replacement

Hello. I have a two story colonial full of similar windows, purchased before our ownership of the home. Within the past two years nearly every window has begun to fall apart. Most common failure is the plastic pivot shoe carrier(?) splitting in two. Followed by the pivot arms snapping. I am in desperate need of a parts source and confirmation that these components can be replaced. We do not have central air (built 1973, hydronic baseboard heat), so proper window operator is essential in the summer. Thank you!

Kipp