Maybe: http://www.midwestcontrol.com/part.php?id=100?
https://www.midwestcontrol.com/image...8681-82655.jpg
https://www.servocity.com/html/unive...html#.VJVj_Cc4
I was searching for "Servo Universal" on the premise that, if "ball" joints were not available, some other type might work. Several others available, if you'd rather look for yourself.
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