Are you driving this on the street? if so the solids will vibrate your car to pieces over time. Year One, Mancini's and others offer a mount that replaces the factory biscuit mount with one that is locked together inside, but has a rubber cushion to take up the vibration. Basically the top bolt is attached to the bottom plate and the bottom bolt is attached to the top plate so there is some give, but the plates can't be pulled apart like a stock one can. I've used them in my 1970 340 dart for many years and could never destroy one.