I went to a local body shop to see about having them filled and painted.
They advised against it, saying that if I got pulled a ticket for no front plate I'd have to redrill the holes.'
They offered to paint some plastic tabs for me, said come back in a couple of hours and get them.
When I showed up and asked how much, they said no charge, and also gave me a bottle of touch up paint.
I met a guy at my optometrist who was admiring my Stang, saying he was getting one soon, and I offered to email him some sites where I had picked up some mods.
After getting his Stang he asked what I did to plug the holes, and I told him the story, saying that I don't expect he would get them for nothing, but at least he knew they would paint them.
He contacted me later and said when he showed up to get the finished plugs he pulled out his wallet and asked how much.
They told him "no charge, but don't tell anyone, we can't have a bunch of Mustang owners showing up for free plugs".