What year is your Boxster? Aero II Wing on a 2003/2004 should already have hole marks ready for drilling under the lid.
I added an Aero I wing, I liked it better. I had to do the measurements, not too hard.
As for disabling the retractable wing, yes, you’ll need to order this part# 986-612-981-23, cost about $16.
Then follow these instructions, takes about 10 min to do:
5.6.2 Remove the rear luggage compartment lining of the rear luggage compartment and unclip the 6-
pin plug connection to the drive of the retractable spoiler (located to the left of the lock on the
bottom of the retractable spoiler carrier).
5.6.3 Disconnect the 6-pin plug connection and establish the plug connection with the 6-pin cable link.
5.6.4 Clip in the 6-pin plug connection onto the bottom of the carrier again.
6. Concluding work.
Take your time, measure twice, drill once!!!
__________________
-Cesar
03' 986 Midnight Blue Metallic
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Gemballa Lowering Springs | 18” Carrera Light Wheels | Painted Calipers
14/18 H&R Spacers | Aero Wing & Rockers | Powder Coated Exhaust
Creator of CRIOS exhaust mod | De-Snorkeled | De-Ambered
Light Weight Flywheel | Tinted Windows and Windscreen
Painted Bumperettes | 550 Spyder Grille Kit
http://lh5.ggpht.com/_9sTq_sN1KDw/Si...2009%20055.jpg