More detail would help on exactly what Nicklaus driver you have, but I am confident the tip diameter you need for the Driver is .335″. As far as a model of shaft, whatever fits your game. Any .335″ shaft should fit the hosel. On the Hybrid, .335 is not common for tip diameters for hybrids. Most are now .370″. That being said, the Maltby MPF Fairway (MA0290) shaft can be sued for a Hybrid. The Kinetixx Fairway shaft (PK0110) cold also be used. The head weight of the hybrid would dictate how you would trim it, but both have the same trim code and trimming 1″ from he tip and then to final playing length from the butt end (after installation) should work.