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So my original seats were cloth.... But I think had a plug connected for lumbar.
Pictured is my car plug and new seat plug.
I was never aware of the seat plugs being different... But ya learn something everyday, I guess.
How far back did you reach in for the plug on the passenger side? I had my arm in up to my elbow through the hole in the carpet under the passenger side seat, reaching back towards the rear seat area. The plug and harness was taped up to another part of the body harness back there. I just grabbed and pulled and it popped free and pulled it up and out of the hole.