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It's not boot floor vibrations that are the problem.
The stiffness of the mounts can cause the exhaust to crack - but of all the people that have used these mounts I think I have read of it happening to 1 person. It should be fine.
I have replaced the standard rubber with something similar to...
There is plenty left. Plenty.
People break them because they are worth more in parts - it's that simple really. Especially if the car has had a mechanical failure or if the car is modified.