Sometimes I think I read to many forum post on certain subjects - in this case timing chains. I've read several post where people stated "make sure you spend the extra money" and get MB OE on this critical item ( timing chain and rails) and ....don't buy other brands. My experience has show me that many times the OE and OEM brand parts are almost identical with the exception of the MB star,and the OEM manufactures make the OE parts.
I'm unsure of the OEM part/manufacture for the MB timing chain.