This is a rebuilt Steering Idler Arm Assembly for 1949-1954 Chevrolet passenger cars with manual steering. If your car has a factory power steering option, you must provide your original idler arm for us to rebuild. Replaces GM# 3691171, 3691173, 3703795 A worn out steering idler arm is the most common steering problem in these cars. To check yours - have someone turn the wheel back and forth while looking at the idler arm. There should be NO up or down movement at all! Check it out - its probably time for yours to be fixed. These units are sold on an exchange basis. Send in your old idler arm and allow 2 weeks. We have a limited supply of cores. If you do not provide a core and we have a core in stock, you will be charged $200.00 additional for a core. This charge will be refunded when you return your old rebuildable unit.