These risers are designed to work WITH a springer top clamp. Just to be clear, this is NOT a springer top clamp.
The 4 1/4" socket screws can be very tedious to thread in, a 3/16 hex bit and a small ratchet helps it go a bit easier.
The 2 mounting holes are 4.75" apart and will attach to most aftermarket springers with threaded rear legs with the supplied 1/2" socket head screws. Please double check your springer for the correct fit, in some cases you may need to weld in bungs. The top part of the clamp measures just under 4".
4 1/4-28 Stainless Socket Head Screws
2 1/2-20 Stainless Socket Head Screws with washers