Are you talking about the ones with the larger hole and the smaller hole? IE:



VS



The bottom one is used on VWs. Why the two makes use different heat shields for the same injectors I don't know.... something with the differences between the 'benz prechambers and VW swirlchambers?

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
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2013 Fiat 500E.