He can't use one of them as his frame has an Integrated headset, Integrated and Internal are 2 different systems.If you want an internal Chris King headset, try this one. http://chrisking.com/headsets/hds_inset
mick.
And which frames and headsets are those?Not wanting to threadjack but people should also be aware that King headsets are INCOMPATIBLE with Specialized bikes due to 2 different tolerances being used. You will not be covered by warranty from either company if one is installed (you'll most probably be able to do this by hand anyway)