Actually, If I was gonna do something like this, i'd just shave em. I'd put in a set of bumper lenses I didn't want, put in some bondo all around the lens to fill in the space. Then I'd fill in the opening with bondo until it's almost flush, then I'd lay down a layer or two of fiberglass for strength, add a lil more bondo to smoothen things out and then sand it down until it's perfectly smooth, paint and enjoy