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@StandardPractice
i bought a set of Stronglight ST-100O track cranks off of Ribble (.co.uk) last week. they are selling them for 50 squid plus 10% off in the january sale (make sure you type in the code mentioned on their home page) = 45 pounds. sans ring though. JIS taper, 170mm, 130bcd. delivered very promptly. with your 103mm BB (which i presume is a sugino?) you should achieve a perfect chainline. my 107mm BB is very nearly there.
hope this helped.
why 'Arup'? you work for them?