I just completed replacing the convertible top on my 2001 Boxster. I ordered a replacement top from
www.autotopsdirect.com ... German A5 canvas, tinted soft rear window... manufactured by a California company called Sierra ... $389.00. Very impressed with the quality and workmanship of the new top.
Follow Mike Focke's excellent instructions, take your time, and pay attention to details. I also took a boatload of pictures of the removal of the old top with my digital camera.
I used contact cement versus the 3M double-sided tape. The tape just didn't want to adhere to and hold the new canvas top material very well. Finished the job in a weekend (I took my time and sweated every detail of the new top installation). The new top is wrinkle free and functions flawlessly!