Reddit reviews 1/4-20 Furniture Levelers Adjustable Black Glides (4)
We found 1 Reddit comments about 1/4-20 Furniture Levelers Adjustable Black Glides (4). Here are the top ones, ranked by their Reddit score.
It is a custom part. Contact the bed maker.
Can you replace it with an adjustable glide?
Or, as pizzasteak said, modify a square u-bolt to fit.