All of our Tune Up Kits include Original Equipment Manufacturer (OEM) parts to perform a simple tune up. Toro TimeCutter Series Tune Up kit includes air filter, fuel filter, oil filter, spark plugs, oil and a set of new blades. All parts are Genuine Toro, Kohler & Champion. Nothing in this kit is aftermarket. Kohler oil is a specially formulated for this single cylinder engine. This custom kit fits Timecutter Z4200 (Model 74360), TimeCutter Z4220 (Model 74363)