New Stant 55511 FC511 fan clutch. Not sure what it was made for but an internet blog gave a comparison of Ford Mustang 428 Cobra Jet fan clutches and this one was in the list of different fan clutches. The reference numbers given were c8OZ-8a616-b / c9zz-8a616-a / c8oe-b / c8oe-c. Do not know which it might have replaced.
Here are the dimensions: Height: 3.75"; diameter: 7.25"; fan bolt pattern: 3.00"; flange diameter where it mounts to the pump: 2 3/8"; center hub hole: 5/8".
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