Just wanted to let you guys know, I won these off ebay a month or so ago, came from China, all new in glass box, sealed - brand new CB 88 and CB 89 dampers for the kyosho range of 1/6 scale buggies in the 1970s. These look great and function very well. I believe these were the original or initial design, it than changed to once with only the bottom screwable retainer?
I got these and fitted ball head to the top for that scale look and more usability at odd chamber angles, but more for the looks

All vintage brass, nicely machined rod/ball ends. Also I put in a brass bushing at the bottm for the piston shaft so its nice and straight all the time.
All pics are on flickr for convenience. So I am providing a link here. Details of the shock, the mods are explained in some pics.
https://www.flickr.com/photos/110872915@N05/sets/72157647127557149/
Let me know if it is working
thanks