If you want to replace the stock master cylinder or want to up size to a 3/4" bore master, this Wilwood adapter will do the job. We make these adapters from laser cut steel plate to keep the strength up and thickness down. We then insert studs in both mounting directions to make installation easy. The plates are powder coated for corrosion protection and come with the bolting hardware and required clevis end for the Wilwood masters. Wilwood masters, clutch pedals and clutch line adapters sold separately!