I am not aware of a plastic piece for the well liner. As I recall:
the well liner is connected at the front by a stainless steel strip bolted to the back of the rear seat/trunk divider. this strip also serves to hold the top boot in place. the top boot has a plastic/nylon piece sewn into it that 'pinches' into this stainless steel strip at the back seat.
the well liner is connected at the back by the tack strip.
there is a metal rod that goes in a pocket sewn in the well liner. this rod weighs the liner down and is connected to the trunk hinge near the torsion bar by small springs.
Jim
