The NISMO longer studs are the exact same, they both use part number 40222-RS015 and they are both available in 50mm & 60mm applications.
I have the 50mm on my Z and they have worked well with my 20mm H&R spacers for the last 3 years without any issue whatsoever.
You can reference ConceptZ for more info since they carry both 350z & 370z applications:
Nismo 370Z Wheels Studs - Extended - performance parts