Clutch fits fine, BUT you do need to grind a little out, you'll see clear as day when you get it.
Any W5* box it fine, I use a W58 but a W57 is just as good, even a W55 will be fine, just depends what ratios you want.
I'm still using the original cross member, but I highly recommend getting aproper one made up. You'll also need to get a custom drive shaft made up.