Do this when you replace the tensioner: It seems the tensioner is the weak link when anything is done involving the belt. This way even if the tensioner fails, you will always have adequate tension on the belt without slippage or overheating. As far as everything else goes, I don't understand what the issue is, just replace the parts with OE or OEM (not necessarily MB branded from dealership). It shouldn't be that big of a decision since you are dealing with either critical parts or parts that if they fail the job won't necessarily be a 5 min job especially if you aren't doing the work yourself.

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1990 190E 3.0L