I used the MVVS Isolation mount rubbers, there is rubber tube that goes all the way though the false bulkhead with O rings around it and flat washers in front and behind, this effectivly isolates the engine from the main firewall, you should be able to get them from any of the MVVS inporters in you location.

They dampen sound rather than vibration, but do reduce the vibrations some.

Mike

EDIT: added a couple of more pics to hope make this clearer.