Hi Peter,
We recommend the super famous and reliable JWT kits, depending on your choice on flywheels, these are the 2 options, providing your car is a 350z DE:
https://www.torqen.uk/nissan/350z/powertrain/clutch-flywheel-packs/664-350z-de-jim-wolf-technology-jwt-clutch-flywheel-kit-nodular-iron-26lb-flywheel-900kg-clamping-force-l3503-ncfsd.html
or
https://www.torqen.uk/nissan/350z/powertrain/clutch-flywheel-packs/1895-350z-de-jwt-jim-wolf-technology-clutch-and-flywheel-combo-1200kg-clamping-force-l3503-ncf-ktp.html
These will come with pivot ball, line etc, see the description on each.
For slave cylinders see here, depending on your car age:
https://www.torqen.uk/nissan/350z/powertrain/ancillaries/1673-350z-de-05-07-stoptech-premium-clutch-slave-cylinder-13842019.html
or
https://www.torqen.uk/nissan/350z/powertrain/ancillaries/1672-350z-03-04-stoptech-premium-clutch-slave-cylinder-13842017.html
For master cylinder, see our upgrades here:
https://www.torqen.uk/nissan/350z/powertrain/ancillaries/339-350z-de-torqen-tilton-racing-clutch-master-cylinder-trq-350zde-tmc.html
or
https://www.torqen.uk/nissan/350z/powertrain/ancillaries/349-350z-de-torqen-wilwood-heavy-duty-clutch-master-cylinder-trq-350zde-wmc.html
Unless you're seriously committed to track days I wouldn't recommend the solid gearbox mount, there will be a lot of vibration transferred in the cabin.
For clutch fluid, we recommend either StopTech 600 or Motul RBF 660:
https://www.torqen.uk/194-fluids
Hope this helps, but do let us know if you have further questions.