Broken Sash Cam

A contractor from Florida says:
The sash balance springs up past the window. Found the broken sash cam, looks like the plastic broke around where the screw would mount. Found a label on the window that reads Series: 437/438; H-LC35-54X96; H-LC50*-52X76 (Modif). I found other entries but they only provide the part number for the sash balance. I am looking for the top cap.If you could provide a part number for the replacement sash cam it would be greatly appreciated.
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Paul from SWISCO responded:
Start by looking at our 18-161. This may be what you want, but carefully go over our pictures and dimensions to confirm. If it's not a match, we will need to see a picture of your part so that we can find something better. We would also need detailed dimensions.
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