Crack black plastic piece on Roto casement

A quick learner from New Jersey says:
Hi
I need to replace two (left and right) window casement assemblies. They are marked Roto HG04-2001 and 2004U, but I don't see either number in their catalog and am not sure what parts need to be replaces (problem is black plastic piece on end is cracked.). Any help with finding replacements would be appreciated.
Thanks
T
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Tom from SWISCO responded:

Hey, T. Looks like the slide on your hinge has broken. Unfortunately, these cannot be repaired or replaced. I don't know of any company who sells these slides by themselves.

We can help only in that we can provide a complete hinge assembly. I recommend our 36-048. The style is a little different from yours, but they work on the same principle. As long as you replace the top and bottom at the same time then they should work perfectly well. 

Let me know if you have any questions.

How to Replace a 2-Bar Hinge Set on a Casement Window
How to Replace a 2-Bar Hinge Set on a Casement Window
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