Okay i know it is more than likely too late, but here is a quick alternative i found,
NOTE: Myxer may not have the tone you want.
So you download the myxer app
(don't go through your browser to get the myxer tones because you won't get speciall options in like you will in the app.)
search for your tone and when you select "get ringtone" it should bring you to a screen where it allows you to "customize" or "download"
Click customize, this will bring you to a screen where you can even edit the length of the song,when your done messing with that you then Click "Save"
This will bring up a screen that says "save as" you can choose ringtone,alarm,notifications, and music..obviously you want notifications
and Viola it is able to be selected as a tone in your notifications
(It will ask to automatically do it for you, i didn't let it because i wanted to make my texts,and email tones differently)
I know it seems like a lot, but i was also being very detailed and when your doing it it really is not much, also myxer has gotten really popular so it will most likely have the tone you want. hope i have helped someone out there.
P.s you can delete myxer after you have set them and your tones will still be there.