Tapered Headset Spacer

Shaun67 Posts: 219
edited March 2013 in Road general
I'm after a tapered headset space, See picture below. I'm looking for one around 15 to 20mm
in height. I've phoned round loads of bike shop's today and called in at Planet X & JE James,
both tell me, only available with the complete headset !!! Can anyone point me in the right

Many thanks.