On the wheel cylinder there is a place for the brake line to come in, a bleeder port, and a port for the jumper between the wheel cylinders. One cylinder brings in the brake line and has a bleeder and the jumper.( All ports are used). The second wheel cylinder has a bleeder and the jumper but there is no incoming line. This would need to be blocked off or your brake fluid would pour out.
I see the problem now...your truck needs two different wheel cylinders on each side of the truck. The Rear, Front cylinders should have 4 tapped holes while the Rear, Rear cylinders should have 5 tapped holes.
Group 4.665
1951-52 Utility...Rear, Front...cast number 5453825-4...p/n 5453866.
1951-52 Utility...Rear, Rear...cast number 5453825-5...p/n 5453865.
If you look both of these part numbers up on the big auction site you can see the difference and they are available. The hole you're trying to plug isn't machined on the 5453866 part. Buy two of the correct cylinders and your problem is solved.
Mike B
