Ok, a 5/8" 6 point socket fits and the flywheel is off!
and once the flywheel is checked/skimmed if need be,some nice 16mm ARP bolts to hold it back on

couple of questions for the knowledgeable ones...
how easy to remove the bearing that sits in the end of the crankshaft,that the gear goes onto ?
and looking at the plate that goes between the engine and gearbox,is the material that rests on the crankshaft replaceable or just leave alone ?
Thanks once again...