Teak winch pads have tapered sides so this means the base is larger than the top.  3 sizes available.  This one is 85mm base tapering to 65mm at the top.    

Teak winch pad holders, available in 3 sizes.  The pads have tapered sides so this means the base is larger than the top.

This one is 110mm at the top tapering down to 130mm