The electrification of drive trains in current and next generation vehicles require vibration dampers that possess different dynamic properties than its internal combustion engine counterparts. This makes research in automotive vibration damping a hot topic. Research in this field often contains the practice of Frequency Based Substructuring (FBS) in which dynamics of individual components can be used to predict dynamics of an assembly or vice versa. A method to incorporate vibration dampers in FBS is the practice of Full Decoupling but this can be a time consuming and cumbersome exercise so the alternative method of Inverse Substructuring was developed. This approach is quicker and simpler but suffers from shortcomings as underestimating stiffness and neglecting some DoF relations. In this thesis an improvement on this technique is proposed by making use of the geometrical shape of the vibration isolator. This results in better prediction of the dynamics of the vibration isolator in most directions however the dynamicist should make a decision if this simpler method of Improved Inverse Substructuring is more suitable for the application over Full Decoupling.