I have just the booster which bolts up to your dual master cylinder. The dual 7" is intended for 4 wheel discs. You will need "residual valves" for each circuit to prevent backflow with the value dependent on whether you have discs or drums. The brand of the booster is Master Power brakes or something like that. Nowadays they're probably all made at the same chinese factory with a different brand slapped on. sad but true. I'm working 40 hours in the next 2 days so it maybe wednesday before I can get you a pic and find that receipt.