MNSmith, If you could please look and see about a 4700 it would help and if you could even send a picture of it that would be great!
If they do use the mechanical MICO caliper could you confirm it?
Could you also get a part number if it is on it, it soulds like they only make one, but just to be sure...
And if all else fails, I should be able to dig one up if I have the vin number of a truck equiped with one of these mechanical disc parking brakes.
Grigg

By the way, I am using the front and rear axles from a P-van.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-