Soloist Pro Locking Nut Size

[DR5Guy]

I am looking into replacing my 1990 Soloist Pro locking nut. Do you know what size nut I need? I am not very familiar how the R2, R3, etc size work. Also, do I need to consider the fretboard radius?

Thanks!

[MakeAJazzNoiseHere]

If it's an actual OFR nut, it should have the size on the bottom. Although maybe they didn't do that in 1990, I don't remember.

Not universally (esp. in 1990) but they're almost always an R3 on a 1 11/16" nut width neck.