Which vendor manufactures the MAS?

It seems with the mass globalization of products these days, there is no such thing as a german car anymore. I am wondering who Benz vends this part manufacturing out to.

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Patrick Leber
'84 190E 2.3
'83 Porsche 944 (track car)
'84 Porsche 944 (parts car)
85.5 Porsche 944 (sled)