Well, after some extensive research and some help from oem-surplus.com, a Nissan obsolete parts clearinghouse, I finally figured out that any Gen 2 built after 08/86 had the autoseatbelts and a newer steering wheel assembly that incorporated a larger padded center. This applied to the SE's also. If you are looking for OEM parts for your car, I highly recommend checking out
http://oem-surplus.com/nwp
My car was build 5/86, so that is why I have the "flat" horn pad and no auto seatbelts (thank goodness!!!!). If you have ever looked at the section on troubleshooting and repair of the auto system in the SM, you can appreciate the "simplicity" of a centrifcal ratchet!!!!