Apparently the original equipment flywheels and pressure plates were bolted together and then balanced. It's very unlikely to find a clutch system that's survived for 60 years or more without being swapped out. Even if the flywheel X is still there, ignore it! You won't find a corresponding mark on the pressure plate.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!