Need replacement parts for casement windows

For the operator, see our 39-187 and 39-188. Look over the dimensions and see if this type match what you need. If you need a new Tie Bar, please remove it from the window and show us a picture of it in its entirety, so we can discern all the cone/roller and lock drive locations. We also need its length. 

What you're referring to I believe is the casement window hinge. See our 36-004-10. The hinge is, quite literally, what the window 'hinges' on and basically its support for moving outward and inward, whereas the arm on the casement operator is what mechanically pushes it in and pulls it back. Look at the videos on this page for further details as well.