Seal ring, side retainer behind shims , 3834321010 x2
Seal-oil, differential side shafts, 3834221000 x2
Seal-oil, drive pinion flange, 38189U3000 x1
Gasket-gear carrier cover flange, 3835301G00 x1
The oil seals pretty easy source online or from decent bearing/seal shop, they made by NOK and used on lot of model and makes not just nissan (same seal can be found from subaru toyota and hondoo)
He likely going need other parts if rebuilding it such as shims/bearings/clips.
Google numbers and see what options you got in your country .
Take numbers off seals or take to bearing/seal shop, NOK seals are small money .