The back friction plate just has some damping rubbers on the castellated bits, it's the same friction plate (the rubbers are actually a separate part when you get a new clutch), leaving them off makes the clutch rattle more, it is again common to see.
You're right, it's not a complete sequence, but the order is;
thin steel (you can use a thick one)
friction plate with dampers (these don't really matter and are a separate part)
steel plate
friction pate
steel plate
friction pate
steel plate
friction pate
steel plate
If someone has fitted 2 steels at the rear I'd suggest either they looked at a wet clutch diagram and thought the judder spring was another plate or that's all they had, didn't care as they understood how the clutch works and realised it'd work to a degree.
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Last edited by fontyyy on Mon May 28, 2012 10:30 pm; edited 2 times in total