Hi mate. I just replaced the headset on my 2010rockhopper it has exactly the same hs as yours. It was labelled up as a fsr headset.
Ring don skene in Cardiff they are a spesh dealer …. Just use google to find number. They will now know what your talking about.
( they are 45 x 45 but the outer diameter is different / the chamfered edge is different. It was a pain in the bum )
Hope this helps. Whatever happens post back with ur findings.