Tightening up a 3 on the Tree

[BanjoDude]

Hi guys,

I'm trying to tighten up the shift linkage on my '69 C-20 with 3 on the tree. I've replaced the shift linkage bushings and adjusted the linkage, and that made a huge difference. The remainder of the slop is coming from the collar on the column that the shifter connects to (outlined in green in the attached pic). The collar itself wobbles up and down as well as axially a fair bit. I've looked high and low for diagrams on how to rebuild that section and for parts with no luck. Has anyone fixed this successfully? If so, where did you get the parts and the diagram to know what to order and replace?

I can't believe this is so hard to track down given the number of these that were sold. I'm finding a ton of stuff on the automatics and the floor shifters - but not one diagram or parts source for the 3 on the tree. Perhaps I'm missing something right in front of my nose? Any help would be appreciated.