Thanks, but I'm more interested in finding a source for replacement u joints. The originals are externally staked in making proper field restaking with common shop tools difficult. ( You have no way of knowing but, I can and have fixed every system on many cars over the years between owning a shop and my own projects. Engine - trans- rear end rebuilds, Body / paint, even some electronic component level board repairs. )

GM used to inject plastic to lock the joints and replacement joints came with internal clips. The inner portion of the yokes were machined flat to provide a bearing surface for the new clips.

Mercedes yokes are stepped leaving little room for clips. With all the cars out there you'd think someone came up with a work around. If nothing pans out, it will be time to sift through joint spec catalogs to find a match.