my alternator on my 1987 300e is shot. I want to buy my own alternator, and possibly replace it myself. I talked to a mechanic, and he said that bosch makes 2 lines of products, the kind they sell at pep boys/autozone (bad quality), and the kind they sell to mercedes. If i ordered from fastlane, or ******** az, would i be getting the higher quality alternator? Also, how much trouble is it to replace an alternator by yourself?

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87' 300E