96 was the intro year for 722.6 on the SL and S class.
Be aware that 96 and some very early 97 cars had valve body and TCM recalls. If you mix and match parts there will be issues.
For the trans scanner, you need one that plugs in to the 38 pin connector, the under dash OBD won't talk to the trans.
I doubt you will find anything in the 100 to 200 range.
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