Ducati Diavel Workshop Manual page 588

Exhaust system
Important
Assembly operations described below must be performed following sequence X - Y - Z.
Fit the washers (12) on the screws (40).
Insert the screws (40) in the holes of the heat guard (41).
Insert the other three washers (12) and the spacers with collar (42) on the protruding ends of the screws (40).
Note
The spacers (42) must be oriented with the collar (J) facing the heat guard (41) as shown.
Fit the heat guard (41) by starting the screws (40).
Tighten the screws (40) to a torque of 5 Nm ± 10% (Sect. 3 - 3,
and making sure the washers (12) are centred to the collars (J) of the spacers (42).
Check the presence of the rubber pad (46) on the heat guard (45).
Frame torque settings), following sequence Z - X - Y