120mm rear hub capable of taking a 5 or 6 speed block

[bssmaa]

Hi
I am rebuilding an old Pashley Tandem, but am stuck as I cannot get a suitable rear wheel. I have decided to build a rear wheel based around a 120mm hub as I don't fancy spreading the rear drop outs. Does anyone know where I could get such a hub from. I could go up to 125mm hub, if they are available.

regards

Michael