I have a boot cover or soft top cover that goes over the rear shelf when the soft top is down. It came off a 1997 M-edition. It should fit all NAs, but may not match your tan interior exactly. I did find out it will not install on an NB. Asking $75 OBO. Will ship at buyer's expense.
Photos show it being mocked up on my car. Because of the roll bar it can not be installed properly.