I attempted to fix the rocking seat issue. Did everything per the various posts. Think I eliminated most of the rocking. Some still there. I also tied up any loose cables etc as well.

However, I removed the seat back cover and found the head rest assembly (especially passenger side) was a bit loose and seemed to rattle a bit. Shimmed both sides with foam. I also tied down loose cables and lubed springs on the seat back.

Seems to have eliminated/reduced a passenger side rattle I have had ever since I owned the car. Time will tell. Now I need to remove driver's door panel and tighten everything up. Have already done the other three doors.