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Ended up getting them from Ben's Cycle, thankfully had someone in the US who brought them over, wouldn't have bothered if it involved international shipping and customs/handling fees.
Other option I considered - http://www.sjscycles.co.uk/tubus-roundstay-l-prod21528/ in 350mm lenght. The diameter is quoted as 7.6mm, Nitto measures a little smaller - about 7.0-7.2mm if I remember right. Should be easy enough sand them down a to fit. Assume they'll be strong enough as they're Tubus...
For general info, the Nitto will most likely need a set of longer struts too if you want to mount on Straggler/Disc Trucker forks using the mid blade eyelets rather than with p-clips