"P. Any metal clutch assembly, metal flywheel, or metal torque converter
that uses the standard attachment to the crankshaft may be used.
Non-metallic friction surfaces (e.g., clutch disks) are permitted. Dowel
pins may be added. Any hydraulic clutch line may be used. Replacement
or substitution of the clutch slave cylinder is permitted, but
this does not allow non-original methods of clutch actuation (e.g. pull type versus push type)."
The rule reads as such. Any clue why it's there?