you will need a different drive shaft, idle switch on the inlet manifold, neutral safety switch on the firewall, plus the chrome gear stick mechanism, levers, cover, possibly a different speedo cable etc.
That unit looks very dirty, are the pressure switches on it? what about the oil filler tube?
You would need to buy the fluid converter with it.
Make sure all the parts are with it otherwise you will be searching on the SLS site for parts.
Remember also to have an auto rebuilt could cost $$$$$$.cc
It would be wise to try to find out some history of the car the trans comes from.
These are things to think about before making a decision
Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto