OEM=544-018401, 503-620202, 503-620203, 503-901401, 506-169002 SAME AS TFPJ5504, THH45061
Note: Please check your oem serial number to make sure you get the right part. There were 2 piece ignition systems and older 1 piece ignitions on these models above. This is a single piece coil and is the new version and may not work on older saws. No returns on electrical parts.