Mahle might make their own rear main seal. They own Clevite so they might have the ability to make main seals but I really don't know. If they aren't making it themselves then it is most likely a repackaged seal. The pictures on-line rarely are correct.

Fast Fish has a one piece seal for big block Mopar engines. I don't know the story on it. I assume he gets them from the same place that makes one piece seals for various Ford engines.