OK, here is a picture of those numbers.
PICTURE Back to the 14 bolt brake drum swap to make room for u-bolts and brake lines,
Look at these two drums side by side, the old one is what comes on a dual wheel C&C 14 bolt and the new one has the same 13x3.5" brakes but I think comes from a single wheel pickup axle.
PICTURE Now look at how the original 14" drum fits in the 19.5" wheel, and note the drum has very little dish to it.
PICTURE Also the original drum slides over the hub and the 14 bolt drum goes on the back side of the hub, further spacing it from the wheel.
I have not tested this yet but you can see in the pictures and given the drum diameters why I think this drum might be better choice.
To make the swap you'd need to space the backing plate flange out the same as difference in drum height.
