Bilstein Shock Absorber Specifications
From the Bilstein home page catalog, they only list one application for the 85 to 91 350 through 560. I am sure that this includes the euro models. The 86 to 89 560 SL came standard with the heavy duty as part of the suspension changes for the model. It received parts from the 124 chassis as well as anti squat upgrades on the rear. Many suspension parts are unique to the 86 to 89 series.
BD
http://www.bilstein.com/specs.html
Search Results
Note: Multiple results indicate different settings, different shocks for right and left, or both.
1 Match
Make: MERCEDES BENZ
Model: Series R107 - 350SL/560SL
Year: 9/85-91
Blank: HD
Front: B36-0524
Rear: B46-1184
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http://www.bilstein.com/specs.html