Socket Head Caps / Covers

Anyone know where I can source these from?
I'm desperate for some chrome insert caps in M5 - M10 sizes.
http://www.flickr.com/photos/42072524@N06/3878503535 /
Google is not being my friend tonight & is throwing up its usual nonsense.
In fact, a comprehensive & VFM stockist of fasteners in general would be handy.
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