Here is the file the service technician gave me. It's in Italian, of course, but there's a part number at the bottom for the damper kit which should help anyone having trouble getting the dealers to order it.
Top man.
Here is the translation:-
OPERATING CYCLE
Place the car on a lift, then lift it, operating on the rear of the car
do the following:
NOTE operations are described on the left side; the right side are mirror.
• Unscrew and remove the screw fixing the lower caliper disc brakes (1 - Fig.1).
• Make sure the hole is clean and there are no residues of adhesive substances and / or thread lock.
Fig. 1
• Withdraw 2 Parts Kit No. 52025558 (one per side) each containing a mass damping
(A - Fig. 2) and the fastening screw with double thread (B - Fig. 2)
Fig. 2
With a 13 mm wrench tighten the hanger bolt (B - Fig. 2) on the lower fixing brake caliper
disc (1 - Figure 3) and tighten to 3.45 ± 0.35 m.daN.
Fig. 3
• Screw the damping mass (1 - Figure 4) on the threaded shank of the hanger bolt; with a
30 Torx wrench tighten to 0.8 ± 0.1 m.daN.
Fig. 4
• Rotate and close the cap para powder (1 - Fig. 5)
• Repeat the same operation on the other side.
• Lower the car and remove it from the lift.
Fig. 5
PARTS AVAILABILITY
Version Description Order No. Q. ty
T. T. concerned Kit mass damping 52025558 2