Need help/suggestions on plugging a bumper hole

I recently ordered this CTR replica rear bumper for my SI and it has these holes in the bumper that didn't come with plugs. When I called Ikon, they told me they don't sell plugs and they are there for reverse sensors that would be placed there. As far as I know, my car doesn't have reverse sensors other than it's rear view camera.

The material says its PP injection plastic, so I'm wondering what do you guys think I could plug this up with before I get it painted?

Check out this thread. Perhaps they'd fit.

https://www.civicx.com/threads/front-license-plate-hole-plugs.4416/

Honda Hopeful said:

Check out this thread. Perhaps they'd fit.

https://www.civicx.com/threads/front-license-plate-hole-plugs.4416/

Click to expand...

That could probably work depending on their size. I'll see whats cheaper, maybe the paint shop can fill it too