As best as I could tell, these are the dimensions as they are installed in the boat.
I got down on my knees and measured as best as I could:
4.5 x 2.75. Inside measurements
8" x 6". Outside
And if you try and measure the depth (the thickness of the side hull) from the outside thru the inside, its about 3.25".
Not every Hawse is exactly the same.