Mystery Carbide tip

[Erie Fred]

Judging by the printing on the box, they are probably at least 30 years old. I wouldn’t bother finding a holder as the likely hood of finding another box is remote ,and technology has moved on considerably in the last ten years,let alone thirty

I buy plenty of NOS normal generic carbide lathe inserts.
Don't poo poo stuff that simply works, is the OP running a CNC lathe to the extreme ?

 

[winchman]

My lathe is a 100 year old Drummond

 

[Johnnybravo]

My lathe is a 100 year old Drummond

So most likely doesn’t have the rpm to do carbide justice anyway