Not sure what you mean. post a photo of your brakes. pads usually come in "threaded" and "smooth" posts. the pads must be designed for your brake caliper. most brakes made for the past decade or so use a threaded one, so if yours uses a smooth post, it's probably an older brake. IME, getting the smooth post pads adjusted, and getting them to stay there, is a giant PITA. u-brake calipers are not very expensive so I'd think about replacing the brake if that is the case.