Big Port Classic Springer Forks Handlebar Riser Stud Bolt 1/2 UNC 13TPI
Thread Size in Riser End: 1/2 UNC 13TPI. Thread size on fork end: To suit Big Port Classic Springer forks. 20" Black forks: 183978159826. 18" Black Forks: 183971317299. 1" Brass Risers: 18502 9 445638.