There is one compressor for both seats, located under the passenger seat.
For the seat wiring, if you cut it at the driver'* door area, then the harness will be complete. There would have also been an air line in there with white ends that plug in under the seats going from passenger to driver. I seem to remember when mine came undone under my driver'* seat, I lost lumbar in both seats.
I am trying to get a hold of a friend who might have a complete seat wiring harness with the air hose right now and will let you know if I find it.
2007 Saturn Aura XR | 1970 Chevy Blazer 4x4 | 1970 GMC 3/4 Suburban 4x4