Mercedes-Benz R129 SL-Class 1990-2002
Model years 1990-1996 have 12 hydraulic cylinders in the top system.
Model years 1997-2002 have 11 hydraulic cylinders in the top system
(left tonneau cover lock cylinder omitted in model years 1997-2002).
Top Hydraulics does not service roll bar cylinders, which fail very rarely.