Do this
You have to download the 06 Arai helmet shape (http://www.grandprixgames.org/read.php?25,645230)
Then you go to Helmets > Shape and back up your AraiWing Folder and then extract the files in the download from the folder Arai with Wing to the AraiWing folder in CSM. This will make the 2007 helmets work but not the 2006 ones already in the game because they are for a different shape.
So you have to replace them all with ones from here (http://www.gp4italia.org/modules.php?name=Downloads&d_op=viewdownload&cid=191 the first one on that list)
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"When you begin in this sport you are given a chequebook. Every time you have a big one you must write a check to the angels. The trick is to finish your career before you empty the chequebook".