8.25 solid pinion spacer.

Just watched a Youtube video Chrysler Master Tech 1969, volume 69-5 showing the large collapsable spacer. When did the split come between the older and newer diffs? Thinking 1969 to 1975 the 76 and up use the smaller sleeve. Guess you cant get a solid spacer for the older diffs? Looked on Yukon Gears site and they show the same eliminator for all 8 1/4s . Now to find a collapsable sleeve.