Should be a picture of the hand E-Brake fitted in my '50 1/2 ton here
E-Brake photo I fitted a lever from an earlier Chevy truck, there's plenty of room for it to work with the bench seat. The lever setup is fitted a bracket that bolts to the side of the Brake master cylinder mounting that's under the floor. The operating rod from the lever lines up almost perfectly with the stock E-Brake cross shaft.