Ok I did some scientific experiments....
The "grommet" is essentially a piece of cylindrical rubber that fits around the pushrod and is slightly bigger in diameter to help secure the pushrod in the MC...
Here the correct grommet (the one that is torn...), one of the black orings that is the same diameter, and a green oring that I wrapped 2x around the pushrod and secured the pushrod in the new MC.
Here is a rubber plug that I found that is the same size diameter but with the slight slope it may be able to fit in the 7/8 MC pushrod hole since it is slightly smaller diameter than the original MC pushrod hole.
I tried pulling my pushrod out just now while attached to the pedal and I couldn't get it out...
Lastly, here are some teeth, your upper right ones, and the one in the middle is cut for a crown...
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