Where can I get this type of speaker bracket from?

[Watchman]

Years ago, when I had a separates HiFi system, my Mission 751s sat on a pair of tubular frame speaker brackets, from Target. Like this:



Over time, the Missions got passed around the family, and have returned to me in a tatty state but absolutely suitable for the garage/workshop. However, the speaker brackets have become lost over the 25 years since I last saw them.

Where can I get some brackets like these from? No-one seems to sell anything like this anymore. I'm not sure whether they are simply not the in-thing these days but they would be perfect in the space I've available in my garage/workshop.

Any help gratefully acknowledged.