If you remove the rear folding access panel you gain access to the four bolts holding down the rear panel. In your case you might have to remove the third seat, I just have the folding panel. If you're lucky, the tac welded fasteners up inside the body that the upper shock mount fasten to won't snap off in removing or installing the new mounts. On both my 94 and 97 850s I ended up using new nuts and bolts back up in there because the tac welded stuff failed as I tried to replace the upper mounts. It might be a good idea to have replacement hardware on the ready, just in case. Or in case your luck is anything like mine. A pretty straight forward job otherwise.
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Wallie