What size are the rivets that come with this flare set: FIBERGLASS FLARES SET OF 4 Item #: 5604? I need a few additional to complete an install. thanks

• Will they fit a existing cut from a older set of bushwhacker flares fitment
• With the fiberglass how wide are they? 4 inch? What if you have dual tanks do you have to cut the flare? general
• Are they paintable? general