A genuine John Deere #M78543 Spark Plug For 100, G100, GT, JS, L100, LA100, LT, LX, SST, and EZtrak Series mowers. Original equipment plugs can improve ease of starting, acceleration, fuel economy, and provide longer life. Original Equipment (OEM) part.Fits:102, 115, 145, 155C, 190CG100, G110GT225, GT235 with Briggs & Stratton engineJS40, JS63, JS63CL100, L108, L111, L120LA100, LA105, LA110, LA115, LA120, LA125, LA130, LA135, LA140, LA145, LA150, LA165, LA175LT133, LT150, LT155, LT160, LT166, LT170LTR155, LTR166LX173, LX255, LX266C, LX288 with Briggs & Stratton engineSST15, SST16, SST18Z225, Z245, Z425D100, D110, D120 (ENGINE 331877-0238-G1), D130 (ENGINE 407777-0283-G1), D140 (ENGINE 407777-0283-G1), D150 (ENGINE 40H777-0274-G1), D160 (ENGINE 40H777-0274-G1), D170 (ENGINE 40H777-0274-G1)