series 1 came with the 4piece cork gasket,

series 2 came with the one piece.

they are interchangerble, but the tourque setting for the cork gasket is 8-9 lb/ft as opposed to the rubber haskets 5-7 lb/ft tourque setting.

one piece rubber gasket is £22 ans cork one is £27 last time i checked.

ive done 5now with onlt two being succesfull.

allow a whole day for the job (if its your first go)

dont use gasket sealent on a rubbergasket.
and make sure you follow the tightening sequence.

exhust (just drop it of at the turbo and support it with a piece of wood) and starter do HAVE to come of!!!!!