I have old shrock kitchen drawers and the plastic back plate cracked. The track has a width of 1 inch and the it seems that the plastic back plate is 1 1/16 inches wide.
I called Shrock and they no longer have any parts.
The glide is 21 1/2 inches long and the back plate is 3 3/4 inches and the track slides to 3 inches so that the back plate can fort on on the support and be screwed in.
Thank yo,
Lynn