Would anyone have a list of OE Mercedes parts suppliers? For example, Beru, Bosch, etc.. Also are Swag timing rails a OE supplier? I buy aftermarket parts and, on occasion, Mercedes parts when I want the star to be visible. I am wondering about the quality of some of the OEM manufactures compared to OE.

Thanks,

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87 560 SL
93 300E 2.8
91 300CE-24