Detailed adapter dimensions are:
The Diameter of the pad is 4.77" (approx 4.3/4").
The Height of the pad is 1.00".
The
Radius of the pad is 2.375" (approx 2-3/8").
The Hole in the center is 0.643" (approx. 5/8") to a depth of 0.603" (approx. 5/8") and has a diameter of 0.458" (approx. 7/16") for the remainder of the hole to the bottom of the pad.