Hi I replaced mine a few years back for a 2000 B34 (basically same size as the 350)...SGS part was GSV14-250 which has a 1200n gas pressure. My original had a 3 number part code stenciled on the strut which relate to bore size, stroke length and gas pressure. My original strut had part number G28-250-1200n-02. G28 is diameter, 250 stroke length and 1200 the pressure in Newtons.
cheers