The integral equation perturbation theory of Lado, Madden and Fitts(MF) was combined with the Optimized Cluster Theory (OCT) of Weeks-Chandler-Andersen in calculating the radial distribution functions for two oscillatory potentials suggested for liquid sodium and aluminium. These calculations properly take into account the softness of the repulsive part of these potentials. The results are compared with molecular dynamic simulations, the high temperature(HTA) and with Percus-Yevick and Mean spherical model results.