Possibly wheel bearing failure

[240sxHitman]

I replaced my rear hubs and bearings when I converted to 5 lug with the ichiba conversion set. This was done sometime in Feb and now i hear i whining sound. A tech at my job was in the car and said its a wheel bearing. I havent been able to take it out out and take a closer look it at. IF it is bad, i should be able to contach phase2(where i bought it) or ichiba for a possible replacment? or what year could i just get the bearing from and press the hub into thats a direct replacement?