The mount assy for the upper spray arm broke and I ordered a new one part #ap3178206 and the mount top #ap3044815. The mount assy looks different than the old one and looks different than the picture on the web site. there should be a hole for the screw to fasten the mount top. This hole does not exist! Also, the mount assy portion that extends thru the spray arm is not perpendicular to the part that attaches to the upper rack and causes the spray arm to sit in a position that would prevent it from rotating.