I believe that the kit is for all of the 722.3 transmissions. This is one of the few internal parts that you can purchase from MB for the valve body. It is my understanding that this is an upgrade.

I recently rebuilt the transmission in my 1995 E320 and used this kit. I couldn't be happier with the results. The transmissions shifts perfectly and there is no 2-3 flare or harsh shifts. I spent about $700 on original parts and gaskets. This was the first automatic transmission that I had ever taken apart but with the excellent documentation available on line I found the job quite enjoyable. I took my time and ordered additional parts as required during the reassembly. Total downtime was about 8 weeks but that included a 2 week vacation during that time.