I've run poly engine mounts before and didn't notice any additional harshness. Do solid mounts on both sides and that's another story...
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I broke a stud off a Schumacher mount while just getting it snug before I applied the proper torque. It wasn't one of their special mounts though but something that was supposed to be a factory replacement.
I don't know what you are working on but Polybushings.com is an almost all Mopar company with really great customer service. They mostly do oddball stuff that none else makes.
I've bought from polybushings.com before. He's a good guy to work with(can't remember his name off hand). But he mostly deals with the 80's fwd mopar stuff.
