Track good, street not so much
I was in your shoes a month ago - I tried the inserts and could not stand the vibration! The shifting was insanely smooth once rolling, worked great at a track day but when idling at a stop, the vibration was unbearable. I had things rattling that I have never heard rattle.
If it is a track car, I would go for it but in my case, I opted to just use new stock side rubber pieces on a new (upgraded) motor mount.
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