Contact this ebay seller:
http://stores.ebay.com/DiscBrakeAdapters
What you want are his 'FAT BOLTS' M10 x 1.25, not the 'FAT BOLTS - GIANT' which are a different thread pitch. For some reason he does not show them at the moment but I have bought from him twice.
They are actually black and nicely CNC'd from 6061 aluminum. Much cheaper than the New Bonneville bolts. You can go to any hardware store and get a standard M10 x 1.25 bolt. On the left you can turn the clamp upside down.