Not trying to hijack, but is it a common problem for that type of rubber isolator to break easily? That's the same type I used in my swap and I've managed to break 2 in the past 3 months.
If your talking about the motor mounts that style breaks often. They do now make a poly lock motor mounts that isn't suppose to break (but they ain't cheap!) and this is a part of the reason why you see people switch to the spool mount style.