The proper plug is neither of the above. It is a special Bosch Platinum.
F 8 DPP332 is a proper Bosch number. If you can't find it the get the plugs at MB under the MB number 004 159 19 03 26.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician