Rear drum tight... Wrong brakes or axles?

Actual factory BBP axle. You can see the center register is a larger diameter and more raised, just like the 8.25" axle flange pictured above. Diameter of the flange is about 5-15/16", the picture with the tape measure isn't a good likeness because the camera is too close, too much angle from the lens to the object to read the tape correctly. But even in that picture you can see it's a much larger diameter than the SBP axle flange. And you can see how much more flange there is between the studs and the outer edge.

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