This hardware kit from obp Motorsport is just what you need to mount a single master cylinder (such as obp or Girling single-outlet) to a bulkhead or pedal assembly.
The all-in one kit includes two high-quality plated steel 5/16-18 UNC button-head Allen bolts (15/16" shank length), two matching Nylock nuts, and four flat washers. Each kit is enough to mount one master cylinder. Plating color may vary from photo.