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@Dammit
WARNING! Dullness ahead, only relevant to a question I was asked about the Cannondale Hollowgram cranks mentioned upthread: http://www.flickr.com/photos/8131181@N05/sets/72157631758354066/
Photographs show the difference between the standard and the SRM axle, the latter is designed to move the entire crank assembly 1mm toward the drive side in order to accommodate the SRM hardware.
If you have a large carbon fibre BB area you will need to use this, possibly with the special SRM bearing shield which will move the crank further toward the drive side.
I've used the SRM axle with a standard bearing shield on my road bike, and standard axle with standard bearing shield on the cross bike, somewhat oddly.