Some waredrobe things I faled to find in shops. Tube ф20mm is fare enough for lightweight things or short spaces.
For typical 1" tubes scale it 1.25
When I figured out that the big one doesn't fit to my print zone It was too late, so I'm not sure it works.
There's a trick with flanges: you have to cut the tube shorter than the height of one flange to put it after.