Hi Biz,
According to the fin bolt chart (found under "Products" ....."Product Assistance"....."Fin Bolt Chart: at the top of this page) the 2012 Isonic 117 Wide uses "iSonic 117 Wide M6 x 70 + 70 = 2 ".
So, you need 2 6mm x 1.0mm x 70mm long fin screws.
Hope this helps,
Roger
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