The whole bracket is indeed removable but it is a pig.
That whole cast alloy piece is the "Accessory mount" and is what the Power steering pump and Alternator is mounted to. You can remove the Inlet manifold, Power steering pump and alternator, then the bracket can just unbolt but chances are this is too much work.
Best bet is to support the engine, undo the rear mount and the right (uk drivers side) mount, then raise the engine a little with a jack. Then use drills, hacksaws etc to destroy the bush.
Replace it with a powerflex bush that requires no special tools to fit. They are only juist available and can be found on shop.Alfisti.net.
Alfa GT 3.2 V6 - Quaife diff, Wizard SS manifolds, Scorpion SS downpipes, Scorption GTA catback, Bilstein b4 Dampers, braided brake lines, MTEC drilled disks, Red Stuff pads.