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

[MoPar~Man]

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 front joint out, and yes, it's 1.078.

Is there any knowledge base out there that knows which C-bodies have which siize U-joint caps?

And regardless what the size is, is it the same for front and back?

 

[1970FuryConv]

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 front joint out, and yes, it's 1.078.

Is there any knowledge base out there that knows which C-bodies have which siize U-joint caps?

And regardless what the size is, is it the same for front and back?

For my 1970 Fury I had a big block/727 driveshaft and 318/904 driveshaft
Both rear u-joints were 3 3/8" wide with 3 1/4" wide pinion yoke. I used NAPA 246 u-joint, 1.078 caps
Front u-joints were 3" W for 904, 3 1/8" W for 727. I think NAPA P# is 315, but I did not replace front u-joint