The original N-60 is in this FR catalog from the 80's.
The name of that part is "N-60 Arm Stabilizer NUT" - this is written on the sticker on my original N-60 that i am using with FR-64fx tonearm. The original N-60 cost at least $250-300
This part is an upgrade over the stock nut the OP is asking for, i have two (one from 64s, another from 64fx). The nut from 64fx is bigger and better.
The name of that part is "N-60 Arm Stabilizer NUT" - this is written on the sticker on my original N-60 that i am using with FR-64fx tonearm. The original N-60 cost at least $250-300
This part is an upgrade over the stock nut the OP is asking for, i have two (one from 64s, another from 64fx). The nut from 64fx is bigger and better.