Again, pretty sure there are NO differences between 65 and 66 fullsize rears. 65-70 B body all use the same bolt-in axle shafts (9783561, same part for Right or Left side), differentials\ring and pinion gears(within three different ratio series), brake drums, backing plates, etc. I have a Hollander Interchange manual that confirms this. Can you show us this article you mentioned that supposedly outlines differences, becasue I am quite curious to see it.
Now....Rear axle HOUSINGS are different between the following year groups among B body: 65-67, 68, 69-70, I think the main difference being coil spring perch size, not anything to do with axle shaft length.
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