I would imagine that partsshop could get you Beru wires.

As to plugs, MB specifically recommends not to use Platinum plugs. I say that because it probably means more than my own recommendation (from experience): Don't use plats. There is absolutely no reason to spend extra money on plugs unless you are trying to cover up defficiencies elsewhere. (over rich mixtures, burning oil, etc.)

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician