Axle Retainers

Just pulled my axles out of my 8 3/4 to change out the axles studs to ARP and noticed that my passenger one (i think) the retainer plate is all bent to hell and it looks like my adjuster has been rubbing on the axle flange pretty bad to where it almost looks like it is grinding it down. Is this common and if not where can I find new plates and retainer. If I didnt ask this right its cause I thinking to hard, Any help???