THIS TUNE UP KIT INCLUDES AN AIR AND PRE FILTER, FUEL AND OIL FILTER, AND TWO SPARK PLUGS. THE AIR AND PRE FILTER REPLACE 24 083 03, 2408303, 24 083 03-S, 2408303S, 24 083 03-S1, 24 083 05, GY20576, 21536400, 2153630, 21536300, 100928 AND 100929. ID: 5 1/2" OD: 7" HEIGHT: 3". THE OIL FILTER REPLACES 52 050 02, 25 050 33-S, 12 050 01 AND 12 050 01-S1. THE FUEL FILTER REPLACES 24 050 10-S, 24 050 13 AND 24 050 10-S1. AND TWO 71GS SPARK PLUGS. FITS M655, M665 Z TRAK MOWERS, ALSO FITS CH18, CH20, CV18-CV25, CH730- CH740, CV675-CV740; FOR 18 THROUGH 25 HP COMMAND ENGINES, AND SG20, ZG23, WORKMAN 3100 AND DEBRIS BLOWER 800. Warning:Lead-Nickel-Cancer and Reproductive Harm