I've never heard of that. I'm familiar with the setup for the 500Es as mentioned earlier.

FWIW, Toyota used to do the same thing with the Solara (farmed out to American Sunroof if I'm not mistaken). Build quality was very poor until they brought the whole process in-house.

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08 W251 R350
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91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280