Does anyone know if the arms on the new Sram fat cranks are the same shape as the standard Sram Mtb arms? I'd love to have power on my mukluk, but can't use my powertap due to the 170mm rear end. I've tried looking at the technical specs, but can't tell if they are or not. If they are the same, I should be able to buy a fat x9 crankset and Stages nds x9 crankarm, however that's a big gamble without knowing it'd work for sure.