Applications: K20A/A2/Z1/Z3 Replacement 4 ply silicone oil cooler hose kit. These are factory replacement for K20A/A2/Z1/Z3 motors or engines. There are two styles of oil cooler hoses, it is only the hose on the back of the motor that changes. Please compare both designs and you can match the hose you have to your factory hose.