Unbolt the rear main seal (6bolts?). This can be a prick if the studs are still in it, which will mean you have to drop the rear of the sump. Replace these studs with bolts while you're at it.
im kinda lost there.. the flywheel n all that is out.. i can see the big seal n small pilot one. are you able to post a pic as it will be easier to understand. thanks