Good question. I imagine you wouldn't want anything that would setup to hard that you could work with it. You could hit your local paint guy up about it, maybe they would have some ideas.
Billet badges could incorporate your Harley vents into something custom. You just have to loosen up your grip on those greenbacks, my Jewish friend.
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I removed the big medal medallion so basically they look like this:
But I think it just looks kind of off, so I would like to remove the little badge and have it filled smooth,and where it says Super Duty. The vents pictured aren't mine, but similar.