I took pics to document here in case someone wanted to know a relatively easy way to get them grommets on the bolt tubes.
Lube the grommet with a tiny bit of oil and stick it in the box end of a 12mm wrench:
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Push the bolt tube into the grommet while rolling it in a circular motion. You might wanna use an 8mm socket on a 1/4" ratchet for easier/more comfortable handling. Held here with one hand so I could take the pic:
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It'll eventually snap into place. Remove it from the wrench and push the grommet the rest of the way on:
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Popping them into the valve cover is really easy. Just put the bolt all the way through the hole, grab the end and pull it while rotating in a circular motion until the inside/bottom side tip of the grommet is all the way in. I forgot to take a pic of this, but you can refer to yours before you remove it to see how it looks when fully seated.