Last thing you might want to consider is the cap on the speedometer drive. This meant to be pushed into the casing so that the gap between the speedometer drive and the casing is 0.5 mm
Note Haynes says 5 mm (!!!! => typical!)
My gap is 1 mm
I'm not sure if I can be bothered to set it again - it will probably leak if I do.
Also I'm going to take the tail cone off of the 4 speed gear box I've got just to see if the speedo parts are different 'cos the W201.018 has different differentials for 4 speed and 5 speed transmission. So this job might not be necessary in my case anyway...