no idea on part numbers.
here is a picture of what im talking about. i swear when i took them out of my 5mt they came out lefty loosy righty tighty lol. that gold colored thing is the key that holds it from turning.
okay glad you got it figured out. they love timing but make sure you log everything to make sure! you will be surprised how much they take compared to a ej205 or a ej257.