Furman Prestige Série Guide De L'utilisateur page 12

REAR RACK EAR MOUNTING (Figure 1.a)
Remove the securing screws from the side and front portions of the P-2300 IT E's adjustable rear rack ear and reinforcement side plate
(located on either chassis side), reverse it and re-attach to the P-2300 IT E chassis.
Reverse the rack ears and re-attach to the P-2300 IT E chassis (as shown here).
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P-2300 IT E OWNER'S MANUAL