Answer: Therafin Surelock Square Bar Headrest Hardware is compatible with both 1-7/8"" and 2"" on center hole spacing and Can be used with any Therafin headrest pad.
Ball diameter is 1""
Outside dimensions: 6.75"" wide x 1.9"" tall
Please refer to the following link for more information:-
https://www.performancehealth.ca/amfile/file/download/file_id/7497/product_id/27785/
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