I don't think either is OE. I believe Mercedes casts their own disks and the OEM disks you get at the dealer are actually cast by Mercedes. I think ATE, Zimmerman, and Balo are all aftermarket, with Balo and Zimmerman being close to OEM quality.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record