Rivco makes a bumper and flag mounts plates they say are "bolted" onto the underside of the bumper. I have a H-D bumper that looks exactly like Rivco's bumper. I'd like to install the Rivco plates to my H-D bumper. I'm wondering if they are indeed bolted on, are the "bolts" self-tappers since they don't come through the top of the bumper or have they welded a nut on the inside of the bumper tube? Does anyone have this setup? I'm also wonder how strong that set-up is.
http://www.rivcoproducts.com/products/product.php?productid=842&cat=436&page=1
http://www.rivcoproducts.com/products/product.php?productid=842&cat=436&page=1