Glass Display Case Slider door standoff

I have a display case that I picked up second hand from a store that went out of business when the owner retired. I use it for my mineral displays.

The glass doors had been in storage for years. I guess they never used them at the store. When I put the doors in, I noticed the glass sliding doors were wobbly at the top and they would bang loudly against the rails and each other. I guess thats why they avoided using them.

After lots of research, I found reference to clips for the slidi