Ronthor Drawer Guide 2857233

I need replacements for a RONTHOR drawer guide.
The pat. number of 2857233 is on the piece.
This guide as a center tongue that fits into the slot that not only centers the part but also provides a base for the wood to slide on/against.

The guide is on the rear of the drawers that are on our furniture that was manufactured by Hardin in 1981

If needed I can provide a picture of the existing part.