replacement window swing arm fastener hardware for casement

Not sure the exact terms but this casement window opens outward and is attached on the right with top and bottom hardware that have a piece that stops it from opening too far and keeps the corner in the track as it opens too. This piece has broken on the bottom. I think we should try to get new ones for the top and bottom. They are both very low profile (meaning: not much clearance between window and sill). Not sure what measurements to take but happy to provide more info!