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I think you need the FTSL freehub. They're not model exactly specific but they're in groups so 3-4 freehubs cover the entire current Mavic range. 2012 onward isn't enough information. I checked what i had and whilst post 2012 it was an ITS-4 freehub so would fit loads of other wheels but not what your after. Looks like the ones you want are only £40 new which isn't bad. 308707701 is the part number as you mentioned but that just means FTSL shimano freehub. So if you see one that just says that it'll be the same.
Thanks a lot for giving me a shout. For a pal so after a new/barely used really. Would be handy if anyone knows whether the free hubs are model specific or actually will any mavic road free hub do - often I see descriptions of 'Mavic Wheels 2012-onward'
cheers