Dear Patsorn,
Good morning.
We would like to inform that we have update information from factory.
The shaft is correct. It can be installed on L556-1289.
Everybody get confuse because the illustration in LiDOS of this modification kit is not update yet and sorry about that.
Mr Maung Maung will explain your guys how to install.
Please find the attached photos and below figure for your reference.
Have a nice day.