i had massive problems with mine. i bought a fidanza flywheel which caused massive headaches... basically the flywheel you are replacing either has a step or no step

i fitted a SECO (made by Exedy) clutch with Fidanza aluminium flywheel and it would not engage gears... reason being that there was a step on the fidanza flywheel and my oem flywheel didnt... and because the fidanza aluminium flywheel is already so light, there was a danger of machining down the step.

i ended up having to pay for labour again, machining the OEM flywheel and had to sell off the Fidanza flywheel.

oh yea, mine was for a dc2... not sure if its the same for EM1s or not... prolly someone else would be able to confirm this for ya