New maintenance tune up kit for the john deere zero turn mowers. The kit comes with a new oil filter, inner and outer air filters, two NGK BPR4ES spark plugs and a fuel filter. The air filters replace John Deere M144100 and M144098. These filters also replace Kohler 25-083 01 and 25-083 04. The outer filter measures 10 3/4" tall by 4 1/8" across, the inside diameter is 2 1/2".