Searching for Square tack glide

Thanks for posting. We don't have an exact replacement for this part, but I suggest you look at the 32-083 Corner Tack Glide or the 32-114 Drawer Glide. The 32-083 pushes in like a tac, so you might have to make a hole for it; however, the 32-114 Drawer Glide pushes into a slot, so you would certainly have to make a hole for it. Compare both and see what you think would work best. If you're concerned both are too thick, you could also consider our 32-020 Corner Glide. This installs using staples or wire nails. Take a look and see what you think.