TBH, I thought all Korean, Indonesian and Chinese SE's came with the plastic nut and I never even checked the existing one to verify the material.
I had ordered a pair of the core ones for both my SE's assuming that they all were built with the plastic.
Glad I decided not to go ahead with the change in the HBII and realize after removing it that it was bone.
I'm an idiot.
A little more research would have proven pertinent here.
Good to know and good for anyone else to know that the SE HB's come with a bone nut.