Barrel adjusters for Shimano 600 calliper brake?

[sisyphus]

Hi

I thought I could use these lovely shimano 600 Calliper brakes I had in a box but then noticed that the little barrel / cable adjusters are missing ( probably used for some other bike)! Would be a shame to not use them but a quick scan of the internet has drawn a blank?
Anyone know how to find these little but essential thingies?

Thanks