I know how to remove the spoiler, but my question is in regards to the two holes where the bolts used to be. Where can I get a cap/plug to cover those holes? I saw grommets at Lowes but those have a hole in the middle of them. I also saw Nylon plugs that might do a great job on wood, but not in this scenario for if it rains. My major concern is if it rains, will water stay out of these areas.

Thanks for your help!

 

There are many covers made of rubber to close holes in the firewall of civics. Maybe you find one with the correct diameter by epc.

f.e.:

 

Those would be perfect. Much better than the other alternatives I've found. Thanks bud!

 

I sealed mine with silicone.

 

I've got silicone so I'm prepared! You mean silicone the rubber caps right?

 

You could do that but I just silicone the holes since I don't plan to use the factory spoiler again.