Spark Plug Compatible With Kohler CH245, CH255, KS530, KS540, KS590, RH255, RH265, XT650, XT675, XT775, XT800, XTX650, XTX675, XTX775 engine Lawn Mower Tractor.Compatible With Toro 20370, 20371, 20377, 20378 Lawn Mower.