Adapts Wilwood or Tilton master cylinder to firewall for clutch use. Includes thread adapter to factory clevis ( or aftermarket replacement)
A 5/8" bore is stock SW20 bore size. (Honda bore size is 3/4, for those swapping transmission) If you have a very short pedal stroke and hard pedal, going to a smaller bore will lengthen and soften the pedal action. If you have a very long and soft pedal travel, a larger bore will shorten the stroke and add resistance.
The Wilwood GS Compact Remote and GS Integral Reservoir versions have the correct push rod length. The Wilwood Compact Remote version might need the threaded push rod shortened for your application.