Looking for some feedback on the quality of big block polyurethane mounts sold by 440 Source. I have yet to find a stock rubber mount that is anywhere close to right so I'm considering these.

It's been reported here before that the rubber mounts on the market today must all come from the same source as they all have the same fitment problem. Bolt hole positioned wrong and dimple in wrong location.

Also wondering about the vibration level of polyurethane compared to rubber mounts?