The handlebar risers bolt into the rear springer leg, which are typically threaded 1/2"-20, and puts the risers at 4-3/4" on center. This is wider than a standard Harley riser pattern of 3-1/2" on center. The best risers for a springer have pass-through bolts that go through the inside top of the riser and thread down into the springer leg. This allows you to full tighten the risers in place without worring about 'clocking' the riser as you tighten it, which you have to do when using springer riser studs. The wider clamping area on handlebars made for springers offer enough width to fit the wider riser pattern, and have knurling in the proper spot for the springer risers.