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Don't know that helmet, but styrofoam is easy to cut.
The HJC CL-17 has removable speaker pockets that allow speakers to be double-sided taped to the shell, vents well, has a removable liner, a Pinlock visor, is SNELL rated, and can be had for a song. If it fits (they lean toward rounder heads), this helmet is a great platform for a Sena BT system.http://www.motorcyclegear.com/street/helmets_and_eyewear/closed_face/hjc/cl_17_helmet.html
I guess we're talking about different things. I'm referring to an actual pocket indentation for the speaker instead of just a pocket for your ear.
There's positives and negatives to having the indentation already formed into the styrofoam. It does make installation simpler, but it places the speaker where the 'average' ear is positioned. Since helmet speakers are so position-sensitive in terms of volume and clarity, the pre-formed position may or may not suit you. Use it as a starting point, but don't be reluctant to try moving the speaker forward or back as required to get the best sound.
It is likely the pockets are not in the exact right place for best sound, but they are close enough.