Is your Scion xB making humming or grinding noises from the rear? It might be time for new wheel bearings. This hub bearing assembly fits both left and right rear sides on 2008-2015 xB models. It includes the bearing, hub, and wheel studs (5 studs, M12x1.5 size) with a 4.5\ bolt pattern and 62mm brake pilot diameter. From AM Autoparts with a huge 10-year warranty. California residents note the Prop 65 warning. Replacing worn bearings improves safety, reduces noise, and prevents wheel damage. Direct replacement for OEM part numbers 4245012090, 538-50227, and others. A must-do repair for higher-mileage xBs. DIY if you have the tools, or any mechanic can swap it out. Keep your ride smooth and quiet!