Greg's webshots album has a pretty good photo log of the Ride-Control (Unison) seat.
Photo #20 (of 53) shows the two passenger seat cushions in place.
Photo #39 shows the bottom cyshion
Photo #50 shows the back cushion (upside down, I think) with one of the the hanging clips viewable.
Where would the handle cover be located? Would that be the handle on the side of the base platform, shown in #22 (and in #9) or the sheet-metal "cover panel" that attaches to the cab seat-platform/base (3700940 in #9)?