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That's pretty useful- they have a diagram with the pad dimensions, which are about the same for all three calipers- just a different thickness.
So pad material is about 43mm high. Divide that by two, add 1-2mm because the edge of the pad will not be exactly with the edge of the rotor, and I would call the effective radius whatever the rotor diameter divided by 2 minus 23mm.
It assumes the centerline of the pistons lines up with the center of the pad material but I don't think it would be off by much. Closer than using the OD of the rotor anyway.
Tonight if I feel like it I'll look up the rotor diameters and play around with the brake math spreadsheet. Guess I could even line the rotor, pad, and caliper up in cad and see what I get for effective radius that way since willwood provides the drawings.
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