Detroit Axle Complete Power Steering Rack and Pinion Assembly for Mercedes-Benz C-Class & E-Class RWD W/Sensor Rear-Wheel Drive (Non-4 Matic) ; With-Servotronic Sensor On Pinion - Complete Power Steering Rack & Pinion Assembly To Activate your Lifetime Warranty; you must send in your core unit. Call us when you order to get a return shipping label for your old unit. New Oil and Lip Seals installed to ensure quality performance, Hydraulically Pressure Tested to Ensure Internal By-Pass for Both High & Low Pressure Tie Rod Load, Road Simulated for Proper Functioning