Vinyl window parts and repair
Your operator appears to be in good condition. When you say the screws stripped out, it is entirely possible that they stripped out on the sash, which is not something we can help with. You would have to see if you can use larger screws or find some other way to repair that, short of getting a new sash. A local hardware store may have what you need.
As for the slider piece, that's part of the hinge assembly. That will need to be replaced and we do sell a match: see our 36-048. This should work as long as you replace the top and bottom at the same time.
That's fantastic news! If you had any questions in the future, you know where to find me.