I've found a Volvo part number on the side - 9163882, but still no luck locating one

Thanks abscate that's helpful. This is the hydraulic feed end of the master cylinder - nothing like the plastic pipe and clip connection offered replacements have

I'm having trouble finding a suitable replacement clutch master cylinder for my 1997 850 Estate. All those offered have clipped plastic hydraulic pipe connection whereas I need one with a metal hydraulic pipe/union connection. Would prefer to replace complete unit, but may have to just replace seals...