Be warned, just because SGF is the original OE manufacture does not mean that parts sold or re-boxed as aftermarket meet the OE specifications. I learned that at AC-Delco school years ago. They had two lines, the OE line and the aftermarket line. In some cases the parts were the same in some cases they were slightly modified mostly to make 1 part fit multiple models and reduce the part number count.

I think the best bet is when you can find aftermarket parts with the MB star ground off. But keep in mind the star may be ground off because the part was rejected by MB.

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To see my 129 parts for sale visit:
http://stores.ebay.com/The-Mercedes-SL-Store
John Roncallo