Looking at the parts book, I don't see a separate part number for a seal. KF tended to use many of the same parts as MOPAR so there may be some cross over.
Originally, the driver side coil spring was heavier to compensate for the driver and battery. If you used one of those springs on the passenger side you'd just end up with a stiffer ride, although I doubt you'd notice it.
If you do locate NOS springs, the driver side will be noted with a white dab of paint on one end.