U-Joint cap size (1.063 vs 1.078 vs 1.125) ?!

I don't know if this is a year-thing, or Dodge/Chrysler/Plymouth thing, or Canada vs US thing, but when looking at rockauto for ujoints for my '67 Canadian Monaco that came with poly 318, RA is listing ujoints with cap diameters of 1.063, 1.078, and 1.125 inches.

A year+ ago when acquiring parts, I bought a 1.063 and 1.125 joints, not knowing which one I actually needed. The manual doesn't spec the cap diameter.

Fast forward to today. After wrestling with the drive shaft, I have the...

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Author: MoPar~Man