if im reading correctly, m1neol is running the stock mount with the r/t mount? the last time i had both, my car vibrated. the idea was that with the r/t on top and stock z mount on bottom, it will not go anywhere even though the rubber should absorb the vibration. someone correct me on this because i know it doesnt sound right at the same time, people say it would vibrate because it does not move up or down.