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Yes very important to keep good fresh grommets so the side covers do not blow off and become lost and or damaged. But also a light coating of silicone or some type of grease that does not react with rubber is also mandatory as it allows the removal and installation of the covers easily, but still grips tight enough not to allow them to blow off.
If you still have the broken off peg, drill a hole in the peg and a hole in the cover where the thicker base part is and using a good epoxy made for plastics glue it all back together and let it sit and cure for a couple days, use a slow cure epoxy as it is strong, not a five minute fast set. By putting a metal pin inside the peg in the holes you drill you strengthen the part stronger than new. A drift pin works well, you do want it to fit somewhat tight. But still loose enough you can coat it with the epoxy.
Kit