I was in the process of re-installing my ES motor mount inserts (that I removed right before the Solo2 nationals in Sept last year) in to brand new (at that time) left and right motor mounts (front and rear of car) and saw that the dog-bone mount was already torn up.
This year, the inserts are legal in STS, so I wanted to put them back in.
I only autocross this car, and probably only did 6 or 7 events since Nationals last year, and I can not believe they were already dead. Luckily I still have the used ones from last year.
That dog-bone mount is really flimsy, so I recommend you go and install at least an insert in that spot.