BUCKLE BOTTOMS FOR FABULOUS FENDERS are bolted to the stirrup of choice, by drilling holes appropriately through the leather, once you have folded over the shank of the stirrup, then putting the bolts in place and tightening and securing them with a plastic loaded bolt that will never undo on its own. Then file off the unneeded bolt. Then place the sleeve on the fender, making a sausage out of it so it will slide through the sleeve, narrow end to the top, then pull it down to cover the buckle . When the sleeve is hanging off the saddle, the buckle should be to the inside.