Abstract: Vibration isolators for a steering column which are optimized to adjust the resonance frequency of the steering column so that it is not at the same frequency as the engine firing pulses of a DoD engine operating in the full economy mode window, nor at road travel vibration frequencies. The vibration isolators are composed of a resilient grommet and a rigid insert, and are located at each mounting bracket of the steering column. Adjustment of grommet durometer, grommet dimensions and grommet width relative to insert length provide a selective compression and resiliency of the grommet which selectively adjusts the resonance frequency of the steering column below the range of frequencies of the engine when operating in economy mode.