78 280Z Hitachi Radio "Bridge" Wiring Harness

I'm having a seriously difficult time finding a replacement "bridge" wiring harness to connect a factory Hitachi AM/FM radio to the console wiring harness.

This part is specific to the 78 280Z only.

The bridge wiring harness is about one foot long and connects to the console wiring harness with a large black plastic electrical connector. The other end has two smaller electrical connectors that plug directly into the stock Hitachi radio.

If anyone knows where I might find one of these harnesses I'd certainly appreciate the help.

Thanks in advance!