I've got 4 of 8 plugs out no problem. 3 of the other ones are broken in such a way the Lisle extractor kit should be able to fix (it's on order) with porcelain stuck in the snapped off electrode shield.

The last is broken at the jamb nut hex. Am I correct in assuming this is a job for an Easy Out? Can anyone confirm it's the #5 Easy Out?

 

All plugs replaced successfully. It was a #6 extractor that did the trick for the last one. (#5 too small).