04-11 Mercedes SLK Convertible Hydraulic Cylinder Repair Kit & More...R171 Material NITRILE 70 RUBBER O-RING.......... ROD Seal Comprehensive Multipage Illustrated Guideline For All Stages Rod Seals, Pump Refill & Hydraulic Oil For the DIY Repair of Front Lock Cylinder Covers Mercedes SLK Class....R171 Chassis...2004 - 2011