THE only way to know for sure is to remove the rear cover! ALL USA 560's had LSD's except the 1991 cars that had ASR! Very few of those were made!
You can spot them very easy because they have 2 ABS sensor holes in the top rather than one in the side!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator