Replacement plastic piece from window

Question

I ordered some Channel Balances from your company and when replacing them I realized there was a plastic piece on the window that had also broken. I've attached two pictures - one of the side where the plastic piece is missing and one of the side where the plastic piece is in place. I need to find a replacement but not sure where to start as I do not know what this piece is called. Any help would be greatly appreciated.

User submitted photos of a window balance.

Tom · Accepted Answer

It's hard to tell which sash guide you need by the sent images, but start by comparing it to the 18-073 top sash guide, and check out the guides on the right side of the page.