Stihl retrofit kit for chain quick tensioning replacement parts: original brand: Stihl item number: 11390071000 EAN number: 795711397470 box contents: 1 x sprocket cover 11396401701, 1 x clamping disc 1123. 6603066001, 1 x wing nut 11216601000, 1 x tree stop 11236640501, 2 x screws 90754784115, 1 x insert 11230212800, 1 x instructions (English language not guaranteed). Installed in engines: MS 1. 71, MS 1, MS 181, MS 211 Note: Model number and type designation can be found on the nameplate of your device.