I doubt very much that they will squeek again. Once stopped they are fixed. I would forget about them.
The Mangusta has a racing chassis, not meant for daily driving, the parts are probably all short term.
The rear lower A Arms have nothing, It pays to pull the long bolts out of the lower hub carriers. The bolts are steel and the hub carriers are aluminum so some very good very thick grease is good. Like old fashioned waterproof wheel bearing grease.
If the steel bolts and the aluminum hub carriers corrode together you get a very strange rear suspension action. I would check to see if you can rotate them. You don't have to take them out to do that