12mm chrome plated allen bolt fits front master cylinder on 2004-up Sportster

and are a reproduction of the hard to find slim Aris headlights you may have seen in old issues of Easyriders

#PSHC-277 5/16-18 x 1-3/4 length Polished Chrome Socket Head Allen Bolt - 10 Pack

They are 35mm in diameter

Hardbody Handlebar Riser Adapter Kit for Springers - Chrome Brand_Dynatek Performance Electronics 12mm chrome plated allen boltThis Handlebar Riser Adapter Kit allows you to use standard 3. 5" on center handlebar risers on your Mid USA springer, as well as most aftermarket springers (springer riser studs vary on OEM or different manufacturer springers). Chrome Plated finish, with included hardware and chrome acorn nuts.