The headliner harness? It may have been discontinued but I can check if you have the VIN. If it's the vehicle side, you don't want to know what that entails. It's a complete vehicle harness.

 

I wasn't having any luck with the replacement.
It's the upper harness section glued to the headliner. I'm presuming it's attached with C39 connectors at three points (front pillars and the right-rear pillar).
Here's the assembly tag, off the back of the headliner (VINs added). Let me know what you turn up. I was just about to write Russell Leslie about it.

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