Yes I have a 722.6 5 speed in a 124. It could be retrofitted into most cars.
Any m103, m104, m111, m102, m119, m117, m120 Engine. Basically as long as you can bolt the bell housing up, you can do the install. It requires the new shifter from the early 722.6 cars, say 1996-1999. The only inputs required are vehicle speed and throttle position or map. The tuning has been extremely difficult. The control unit is from a company called powertrain control solutions. They had it in a military spec vehicle with a 722.6 and I decided to give it a try. I am a mercedes tech and trained on the transmission. This did not even begin to prepare me for making it work properly. I ended up scoping another car for all the duty cycles and hertz and time on for the solenoids and
finding the function to program as close as possible in the TCM.
I have been working with PCS for software modifications to rectify problems in the operation. At this point I have a reliable transmission that does not break my neck when it shifts, but some of the shifts are still harder than I would like.
I am waiting for more tuning for a software change from PCS. I have a glitch in solenoid time tables from previous patch.
It will work pretty well and the company is committed to working on the application for future use.