Appologies - it's a 7 speed in the rear - I made a typo above. I'd inspect it now but I spend 12 hours a day at work and the bike is at home...i try to buy all the parts online.
Can I simply measure the spacing? I'm assuming it's measured from the inner walls?
The front and rear hubs look very much similar - there is no significant hump in the rear.
Actual photos:
