Dave, assuming that the winch fairleads are same across the range of CMP's:
The two wire rope sheaves or pulleys are un-braked and measure in at 8 3/4inch diameter, 1 1/2inch thick, mounted on a vertical pin that passes through a boss top and bottom of both sheaves. This gives an overall height of 3 3/4 inches between the two mounting plates. The top mounting plate is as you have marked, going full width under the chassis rail. There is a lower plate that retains the mounting pins, it is the width of the two sheaves combined, and is basically a wide "U" section welded to the underside of the top plate.
The bottom roller I have goes full side to side, but guessing the diameter would be the same, 3 1/2 inch.
You know there is a set of fairleads on the front bumper as well?
Rich.
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C60S
Austin Champ x 2
Humber 1 Ton & Trailer
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