REPLACES OEM: Stihl: 4238 007 1003. FITS MODELS: Stihl TS410 and TS420 Cutquik Saws. SPECS: Ethanol: Not compatible with greater than 10% ethanol fuel. Includes carburetor mount gasket, cylinder base gasket, muffler gasket, crankcase gasket, oil seals (magneto and PTO) and crankcase cover. ADDITIONAL INFO: Cross Sell: 480-765 Use with 632-704 Cylinder Assembly.