To remove the upper mount, fold the rear seat forward and fold up the carpeting at the leading edge of the rear deck. Remove the rubber dust cover to reveal a cad-plated nut. It can be removed with an open-end wrench. I didn't find it necessary to hold the flats of the shock shaft with a Crescent(R)-style wrench, but you may. Keep parts in the sequence and orientation in which they are removed. The nut is followed by a large dished washer, then another nut, which required another offset-box wrench, 17mm. And lots of patience. Clearly, these are installed at the factory before the rear deck, which is installed before the inner upholstery on the C-pillars. I thought about removing some trim to make access easier, but decided it wouldn't save a bit of effort.