The PQ-4000-00 is a great option to upgrade or replace the nut on just about any guitar, Bass or stringed instrument.  It has been partially shaped with a top radius so most of the work has been done.  All you need to do is final fit and slotting.  It is a common nut blank for Gibson guitars along with many other acoustic or electric guitars.

The PQ-4000-00 is also available in a convenient luthier 10 pack (LQ-4000-10)