2012 fiat 500 frt and rr wheel bearing replacement

anybody replace either front or rear wheel bearing on 2012 fiat 500 ,are aftermarket parts available and any certain procedure required to replace front or rear. I'm pretty certain I have bad bearing ,just not sure weather its front or rear,left or right, I do notice some vibration starting at about 15klm with a droning noise, continues to make noise to about 140klm then subsides,also if i bank hard to the left the noise disappears until I straighten out then back to same situation with the droning. Any help would be appreciated, thanks in advance.