Snap, been trying to figure this out myself, I think it might be possible using a mix and match headset route, I think this might work as the bottom cup but not sure http://www.biketart.com/2593/products/hope-pick-n-mix-bottom-headset-cup-h-1-5-inch-traditional.aspx
if you scroll down to the description click the Hope Pick n' Mix headset brochure it has better measurements listed, I think you need a Hope HS136 bottom cup?
Snap, been trying to figure this out myself, I think it might be possible using a mix and match headset route, I think this might work as the bottom cup but not sure http://www.biketart.com/2593/products/hope-pick-n-mix-bottom-headset-cup-h-1-5-inch-traditional.aspx
if you scroll down to the description click the Hope Pick n' Mix headset brochure it has better measurements listed, I think you need a Hope HS136 bottom cup?