Some of my rear drawer slide rail brackets were broken and for a time I was struggling with how to find new ones. I decided to measure mine and do a simple modeling of them. These mount at the back of where your drawers would go. My rails measured appx. 9mm wide and 23mm tall where they enter the bracket and were a snug press-fit into them. I printed mine in ABS and they've held very well.
The author marked this model as their own original creation.