[Closed] help me find something to fit my huge head!

simple question- ive got a huge 63cm head which is very long from front to back, and i want a mtb helmet to fit it. ive got a giro venti xc style helmet at the moment, but its not very cool, and id prefer something more bmx/skate style. somebody on ebay is selling poc receptor flow helmets for the kind of money i was thinking of spending, but i read a review that theyre quite small-sized, and im worried that even the xxl one will be a bit small for me. does anyone have one of these poc helmets, and if so what do you think of the sizing? anybody got any other suggestions? i used to have the same trouble with motorbike helmets until agv started making xxl`s.