In a word: don't.
I put about 7,500 mi on an MTC tranny mount. I noticed it wasn't working too well after a few hundred miles. I finally pulled it out and put in a ScamTech mount today. Much, much better. In fact I think the mounts are the only ST product I'm really happy with so far (I've got the hydraulic mounts in there as well). The MTC mount passed the visible test, but it just doesn't absorb vibration well.
I have about 2800 on the motor mounts. If you've got the time to change the motor mounts, go for it... I imagine that changing all three together would reduce the wear (old mounts may stress the new ones more).
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alex
'89 765T , 178,3xx mi
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