Have a look on this site. I suggest pages 13, 17 and 20 may have something to offer though you may need to do some modifying. I only read upto page 23 but there are many more pages to look at. You may not find an exact match but something close may do.
Alternatively email them your photo to see if they can help identify or source one.
If you don't come right, try upload the photo to Reddit forum "what is this thing". It's a bigger forum than DIY so thousands of people looking, and they've helped me with really arb parts.
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