THIS TUNE UP KIT INCLUDES AN AIR FILTER WITH PRE FILTER, OIL FILTER, FUEL FILTER AND A SPARK PLUG. THE AIR AND PRE FILTER REPLACE PART NUMBERS AM121608, GY20574, M92359 AND M92360. AIR FILTER ID: 3-3/8" OD: 4-1/2" HEIGHT: 2-13/16". THE OIL FILTER REPLACES AM119567, AM125424, GY20577, LG4153 AND LG492932S. THREAD: 3/4"-16 OD: 3" HEIGHT: 2 1/4" MICRON: 28. THE FUEL FILTER REPLACES AM116304, AM1163041 AND GY20709. AND THE SPARK PLUG IS A RC12YC. FITS MODELS LT133, LT150, LT155, LTR155, STX30, STX38, LX173, LX255, GT225, SST15 AND S162. ALL PARTS ARE SPECIFIC TO THEIR MODEL NUMBERS PLEASE EMAIL YOUR MODEL NUMBER IF UNSURE. Warning:Lead-Nickel-Cancer and Reproductive Harm