Professional™ Rear Upper Rearward Non-Adjustable Control Arm and Ball Joint Assembly (45D10066) by ACDelco®. Quantity: 1 per Pack. Restore your factory feel and ride quality with strong and reliable control arms and components. Made to look, fit, and function just like the OEM, these replacement parts will help you bring back your suspension system to its tip-top condition without any hassles. They’re meticulously designed and tested to meet the highest standards of quality and reliability to ensure dependable operation and lasting service.