https://shop.quaife.co.uk/nissan-200sx-ser-quaife-atb-helical-lsd-differential-viscous-1152
not cheap though
bmw water pump
http://www.ebay.co.uk/itm/BOSCH-12V-Car-Vehicle-Electric-Water-Pump-EWP-/270971252256?pt=LH_DefaultDomain_3&hash=item3f17252e20