The 37-59 kit fits same bore MCs - 1 1/4" bore for 1-ton and larger trucks.
The 1/2 truck brake system design changed in 1951.
What are JC's more than one MC part numbers for a 1952 1/2 ton?
The rebuild kit should match the bore.
One reason for different MCs with the same bore is the difference in the size of the brake line diameter that connects to the MC.
