The Stovebolt Site Forums The Parking Lot Tons 'o Fun 1 Ton dual reservoir master cylinder?

Get the aftermarket mounting bracket from Ecklers.
Use 1976 Corvette master cylinder, will work fine with 1.25" bore wheel cylinders on drum brakes on a 1 ton AD Chevy. It has a 'deep' hole which is what you want for manual brakes. "Shallow" hole is for power brakes.