This bracket is about 20 years old. It is 5.5" long, mounting side is 2" high and opening minus the grove is 1". The slide is 21-5/8" long and is a side mount.
Moe
Bob from SWISCO responded:
November 5, 2020
Hey Moe. See our 32-061 Track Slides and the 32-018 Drawer Sockets. I think you can use this combo as a replacement, but take a look and see what you think.