Here's a tip....if you ever do the flex discs, go ahead and order the trans mount as well. Chances are that along with the flex discs, it has suffered some wear. Mine looked OK but upon closer inspection there were cracks that only showed upon me twisting and applying pressure.
Now, I have to go back underneath her again and change the mount when this could have been done in one shot.
I replaced both guibos and the center carrier bearing and the bracket that holds it.
The guibos were both torn around a few of the bolt holes. The front one looked a tad lopsided.
Oddly enough my car demonstrated no vibration.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT