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the B15 TRANNY PLUGS ARE HEX unlike the square b13/14. so a 14mm fill and a ? drain?
http://www.supercars.net/gallery/132464/1542/835979.jpg
And that means you'll probably get everything you need in one package.
If you want to see if it is truly 17mm you could take a 17mm bolt head and try to put it in there. If it fits properly then it's a 17mm. =D
Edit: Nevermind see unijabnx2000's post below.