Additionally, in the 124 "bible" (a book by Stu Rittter), it states that the lens assemblies have different focus patterns for vehicles that are right-hand as opposed to left-hand drive.
He warns not to install a pair of lenses designed for one side of the road into a car with the opposite side steering (they are physically interchangeable).

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1992 500SEL 25K
1995 E320 40K
1995 SL600 120K
2002 JX8 Sport 43K
2005 Volvo S40 95K
2006 Isuzu NPR 304K (Frankencamper)
2007 Crown Victoria 150K
2014 Smart Electric 20K