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@Rincewind
they're probably road doubles with a single chainring.
for proper track line you need 103. 107 will work fine though.
but there are much better cranks out there for little more, or similar for less.
http://www.ebay.co.uk/itm/Brand-New-Track-Single-Speed-Chainset-Bottom-Bracket-/150980306251?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item232720a54b