The site preference of cobalt and deuterium in the charged and discharged state of a commercial-type metal hydride anode was investigated by high resolution neutron powder diffraction using an alloy with an altered isotope composition. in the alloy La(Ni-58(0.376) Ni-62(0.624))(3.55)Co0.75Mn0.33Al0.30 the isotope ratio of Ni-58 to Ni-62 leads to a zero neutron scattering length for nickel. Rietveld refinement revealed that Al and Mn occupy the midplane 3g sites of the CaCu5 structure, while cobalt has a preference for 3g but also occupies the basal plane 2c sites. The space group of the deuteride remains P6/mmm which differs from the parent LaNi5D7 which is P6(3)mc.