In Keith's defence, the service manual is not at all clear!!
Some time ago I did the same job as you are proposing and I remember that it was easy to duplicate parts, some of which are quite expensive.
Your dealer should really sort this out for you as he can refer to the spares database when ordering.
One thing is clear. You will definitely need the steel wall plate and the two items shown in the drawing.
Then there are longer bolts, the springs for the tilt operation and washers to suit. They are numbered 1,2 and 3 in the drawing and can be ordered by part number by your dealer.
If you obtain all this I don't believe you will need anything else. Just what the other part numbers contain is a mystery!