Don't know if this is relavent but it's my understanding that the Beru plugs are for cars equipped with the "extended duration" glow system. The Bosch are for the standard systems. This from Roy here at M-shop.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250