What are we trying to achieve
If the petrol engine is running correctly there's no vibrations, knock or bangs
It's perfectly happy driving down country lane
You normally only want to stiffen them on a race car
Polybush do some inserts to strengthen the top mount
Pretty sure when they were rallying the panda they used standard mounts, , the cup cars from 2005 were as I have seen all the part that were used layed out on the floor I am 95% sure there's no engine or gearbox only the dog bone one, but these are extreme cars with 3x the power, LSD, 6 speed sequential gearbox and so on