It a mk2 box. It's actually going in a V70R Volvo. I've got a box from a 2009 ST. Reason I'm asking here is, more people do this type of mod on the focus than the Volvo.
I'm also thinking about fitting a quaife diff as my R uses a viscous coupling on the drive shaft which acts a little bit like A lsd, problem is, the drive shaft won't fit the M66 box