Head set for Tarmac 2010

Hurricane151 Posts: 632
edited September 2011 in Workshop
I'm after a new headset for my Spec Tarmac Comp 2010. I am a little confused as to what size i need to get.

I think it is 1 1/8 at the top but 1 1/2 at the bottom which is what is causing the confusion. Am I right in saying that something like a Chris king 1 1/8 headset won't fit correctly due to the different sizes top and bottom.

How do I purchase a headset with different sizes?

Any advice greatly appreciated.