Mission accomplished !
Well, thanks to everyone I got them replaced.
They are hard to break loose.
As for the plugs cost got the OEM F8 DPER at $5.21 each for a total cost of $65
I made to remove the plug wires myself from an 5/8 combination wrench I heated and bent like the MB part, worked like a charm.
A few plugs broke cleanly at the porcelain when removing the boots and I had to fish the loose end out of the boot and vacuum our the plug hole (nothing was visible just playing it safe). Must be a result of less that strait out extraction of the metal jacket.
All in all my first try at repairs in a while and the first on a MB.
Total time involved 2hrs