On the C, the graphite bearing was sort of the standard. IH offered the steel bearing as an option on the SuperC as part of it's Hydra-Creeper package, the use of which required blocking the clutch pedal down, allowing a hydraulic motor to move the tractor.
I'm sorry I'm not familiar enough with Cubs to discuss any similarities or differences. The graphite bearing on the c/sc was basically a truncated cone of a graphite compund molded or cemented into a cast carrier which, in turn, is mounted to the clutch fork with pins much as you describe for the Cub. Its face was shaped to allow the clutch fingers to recess into it.
The replacement steel bearing and its carrier are two separate items. The carrier is a cast piece (essentially the same shape as the cast base of the graphite bearing, but with different dimensions to compensate for the depth along the shaft of the actual bearing), and mounts to the fork in the same way. Where the graphite block would have been, the carrier is machined for a steel bearing to be pressed in.
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