The repair kit is for 8 cylinder aluminum flow dividers from KE-Jetronik. 1 sealing set from each series is tested in endurance testing on the test bench and in the vehicle. It is important to use the right material with the exact material thickness, as other materials or material thicknesses can lead to problems with the engine running or a defect in the diaphragm! All O-rings are packaged in the appropriate fuel distributor to fit the flow divider, so there is no need to look for the right O-ring! Since some of the O-rings only differ in size very slightly, if the wrong size is used, the O-ring could shear off and lead to the failure of the flow divider after a short time. You are also welcome to send the fuel distributor to us after the repair so that we can check and adjust it. MADE IN