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sacredhart
Howard
The 109mm axle and the BB30 DS and NDS spacers are what you need. Might as well get the cannondale bearing shields and a new wavey washer whilst you are at it.
http://www.cannondale.com/~/media/Files/PDF/Dorel/Cannondale/Common/Support/Accessories/SISL2_Road_Crankset_Instr_1012.ashx
I believe there's no difference in profile between the Si and SiSL2 arms.