broken back bracket for kitchen drawer slide - left side

A home owner from Minneapolis, MN says:
The plastic piece at the bottom of the back bracket broke, so the drawer slide adapter won't stay in place. I can't see any manufacturer markings on either the hardware or the cabinets. The cabinets are circa 1996. Do you have any idea what replacement part will work and where I might find it?

Unskilled Homeowner in need of a quick repair
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Tom from SWISCO responded:
We may be able to help, but we'll need to see a couple pictures of the hardware in question. If you have an undamaged version, that would be ideal. Please also provide measurements as best as you can. Specifically, we'll need to know the size of the opening that accepts the track. This is one of the more important details.
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