Thumbs up for KFVintage from me. Bought a few things from them.
There's also
1970-1973 Datsun 240z Restoration Parts Catalog
Datsun 240z parts for sale ⚡ Shop 1970-1973 Datsun body parts, clutch line, brake line kit, fenders, floor pans, body panels, emblems. 240z Datsun parts catalogresurrectedclassics.com
Not used them personally, but they are an alternative..
Just got them from Andy