Ness-Tech Hydraulic Clutch Rebuild Kit, 5/8". Ness-Tech Product 06-634.
Source: Custom ChromeSKU: 05322
Two distinct designs have been used in Arlen Ness® brake and clutch master cylinders. Master cylinders manufactured through 1993 have a straight spring and no identifying marks on the body. From 1994 on, they have a cone-shaped spring and REV C stamped on the body where it mounts to the handlebar.