Front Lower Trailing Arm Left Right For Mercedes S-Class W221 2005-2013 A2213303711 A2213306511

Q1: Which vehicles does this fit? Mercedes-Benz S-Class W221 (2005–2013) per the supplier table. European catalog data confirms S-Class 2005–2013. Confirm the exact model and year by VIN.

Q2: Why are there two OE numbers per side? Both numbers per side are the same-arm family (catalog-verified): Left A2213303711 + A2213306511 and Right A2213303811 + A2213306611 (incl. the S1 variants 221 330 65 11 S1 / 221 330 66 11 S1). Order by either number; confirm by VIN.

Q3: Is the left/right side interchangeable? No — this is a mirror pair: left (A2213303711 / A2213306511) and right (A2213303811 / A2213306611) are side-specific and NOT interchangeable. Order by side.

Q4: What is this arm exactly? The front lower trailing arm / track control arm — position: Front Axle, Lower, Front (Right position catalog-verified; Left per supplier table). Steel construction, with ball joint and with rubber mount (catalog: supplementary info).

Q5: Are the ball joint and rubber mount included? Yes — the arm is supplied with ball joint and with rubber mount (catalog: supplementary info).

Q6: Do I need to replace both sides at the same time? Same-axle pair replacement is strongly recommended; an old arm on the other side causes uneven geometry and tire wear.

Q7: What should I pay attention to during installation? Tighten all bolts to the workshop-manual torque specifications with the suspension under load; after installation perform a wheel alignment (camber/caster/toe) and check the ride height per workshop manual.

Q8: Warranty policy and shipping damage? 18-month warranty under normal use. For shipping damage, inspect within 48 hours of receipt and send photos/video — the seller arranges a replacement.

Q9: Service life and maintenance? Depends on road conditions and climate. Check the bush for cracks and the ball joint for play during routine service; replace the arm if bush wear, play or crash damage is found.

Q10: Are aftermarket alternatives available? The interchange list for these OE numbers is available on request. Order by the exact OE number and confirm the model/year and side by VIN.