I bought my holders for my old CNC mill here; https://www.engineeringsupplies.co.u...system/page/2/
They are a very good company to deal with, when they inadvertently sent me an incorrect holder as part of an order they got the replacement out to me the next day.
They are like rocking horse manure so all the holders went with the mill when I sold it, there are always multiple want ads on the model engineering forum sites,
Regards,
Nick