I don’t think so…

http://www.chainreactioncycles.com/nukeproof-warhead-44-56iits-headset-2014/rp-prod92336

…. Because I’ve measured the bottom cup/frame interface at precisely 55.0mm
According to Cane creek, that size does exist, but it confuses their headset finder a little.
Any ideas?
I’d be quite happy with a pair of bearings on their own TBH

Cheers 🙂

Just bought the exact headset cups you need from wiggle.
Gusset do mix a match headsets(like hope but cheaper)
Sounds like you need the lower headset ‘F’ in 55mm which normally fits Scott/Lapierre frames.

There currently on sale at £14.99 a end.
http://www.wiggle.co.uk/gusset-mix-and-match-headset/