260Z radio wiring

Have installed a Hitachi, M/N KM-1520ZD, Car radio it matches the wiring diagram in 1974 Datsun 260Z sevice manual. I've got 5 wires coming off the radio:

(1) Radio power and spreakers - blue w/fuse holder, white, white/black, (it was chopped off before i got my hands on it)

(2) Ground Wire - Black (connector was chopped off before i got my hands on it) Needs a new lug connector

(3) Radio light - red/blue with female bullet connector on the end. I just added from spares (it was chopped off before i got my hands on it)

I want to return it to factory, down to the wiring. Does anyone know where to get the correct connectors for number (1)?

Does anyone know where the two black wires were attached.