rear suspension

I just purchased a 2010 rancher, after doing the front & rear brakes I figured out it had a lift kit on it. On the front where the shock mou ts to the. Control.arm the holes on the arm are elongated on both sides, guess I need to replace the upper arms ?. On the rear on the right side the swing arm has really bad play I don’t think that just bearings will do, any suggestions on best parts suppliers, new to forum.