96-04 Mercedes SLK 230 Convertible Hydraulic Cylinder Repair Kit & More...R170 Material NITRILE 70 RUBBER O-RING.......... ROD Seals Comprehensive Multipage Illustrated Guideline For All Stages Rod Seals, Pump Refill & Hydraulic Oil For the DIY Repair of all 5 Vario Roof Hydraulic Cylinders Covers Mercedes SLK Class....R170 Chassis...1996 - 2004