GetCarChassisMaterial().color = DataCollection.CAR_COLOR_OPTIONS[colorIndex];

Material GetCarChassisMaterial()
{
    Material[] carSharedMats = carChassisMeshRenderers[currentCarIndex].sharedMaterials;
    for (int i = 0; i < carSharedMats.Length; i++)
    {
        if (RemoveInstanceFromName(carSharedMats[i].name).Equals(carsChasisMat[currentCarIndex].name))
            return carSharedMats[i];
    }

    return carsChasisMat[currentCarIndex];
}

// remove "(Instance)" word from runtime created material name
private string RemoveInstanceFromName(string name)
{
    return name.Split(new char[] { ' ' })[0];
}