Griggs Racing sells a badass wing and it comes with 4 aluminum caps to plug the holes. You should contact them and see if they sell them seperate. The wing is not available at the moment due to the mold being tied up in the legal system but i'm sure they still have the caps
When I had mine off I just had a local vinyl shop make me some gloss black circles about 1.5" diameter and used those to cover the holes. Looked decent and worked great. I've since put the spoiler back on though.
black electrical tape on a white cobra lol. sanding this S281 is taking forever; lack of time. Its monsoon season here and that's all I had in my car when the rain hit lol