As it turns out, the gasket had been installed backwards (inside-out?) on the rear window - the rib is meant to be hidden! This time the body shop used an installer who had experience with M-B, and the gasket looks great.
Special thanks to Phil @ FastLane for an (as always) incredibly fast response to an email question (regarding the correct part number for this).
Dan
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2001 e320 wagon
2004 F350
2006 Crown Vic
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