Pelican Technical Article: Installing the Boxster Hardtop and Installation Kit - 986 / 987
Fiddly, but not terribly difficult. Be sure and do the hold-the-shoulder-bolt-with-a-baggy trick. The job is much easier, and you can actually see what you are doing, if you remove the carpeted pieces behind the seatbelts. Do a search. I found this on Google (your friend
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http://986forum.com/forums/general-discussions/1607-hardtop-installation-question-print.html