Hi Frank, I'm glad to help you out. Unfortunately, we do not have that diameter data readily available. This pair of sway bar links is a guaranteed and direct fit part specifically designed only for the selected vehicle application covering from 2003-2009 Lexus GX470, Base 8 Cyl 4.7L / 2003-2009 Toyota 4Runner Limited, 8 Cyl 4.7L / 2007-2014 Toyota FJ Cruiser, Base 6 Cyl 4.0L / 2010-2016 Toyota 4Runner Trail, 6 Cyl 4.0L --Except Kinetic Dynamic Suspension fitment. If you have the matching vehicle, this will fit and will be compatible. The dimensions of the part is not noted anymore since you have to accurately select your vehicle application(year, make model, submodel and engine size, drivetrain if needed-2WD,4WD/AWD) and the resulting search would show the exact parts designed for that specific vehicle application only. You can also refer to a vehicle specific service repair manual for that data or best if you can call your local dealership to ask for that data. I hope this helps. Happy shopping.