Tool Swap
 

Edit;

Note to all people draining transmission fluid for the 5 speed boxsters; be sure to buy the anti-tamper proof version. 101 Projects is slightly misleading in regards to tools. States 16mm triple square in tools needed, then later informs you need the anti-tamper proof further in the article.

http://986forum.com/forums/uploads01...1339705173.jpg
In my hand lies the accursed triple square that is useless.

I made a similar mistake last week in purchasing the wrong allen. I wound up ordering it off eBay for $22 shipped. Sorry not able to help unless you're in the San Diego area, you may want to post asking if there's anyone in your area that has one also.

Hope that helps some, if you want to lead to the guy on eBay let me know

Much appreciated, Leeper. Went and purchased. :o

On my MY2000 I also needed to get a 17mm Allen for the filler bolt, happened to have one from my motorcycle days. The 16MM socket for the drain plug arrived a day after ordering here in Cal...

I got mine at a local independent auto parts store. It was for VW cars, but it is the same tool. $6.