Parts for your 2011 Lexus Is-Strut mounts

2011 Lexus IS strut mounts — what’s actually fitted

Based on Lexus technical literature for the 2011 IS (XE20 series) — including the Lexus New Car Features (NCF), the Repair Manual suspension section, and Toyota’s Electronic Parts Catalog — the front suspension is a double‑wishbone design and the rear is multi‑link. That means the vehicle does not use MacPherson “strut” assemblies or steering strut mounts with integrated bearings. Instead, it runs separate shock absorbers (dampers) and coil springs with upper shock insulators/supports. So while some aftermarket catalogues loosely list “strut mounts” for the 2011 Lexus IS, the accurate parts are shock absorber upper mounts/insulators (no steering bearing), spring seats, dust boots and bump stops.

Why no strut mounts? In a MacPherson setup, the damper is the main structural member and turns with the steering, so a strut mount with a bearing is essential. In the IS’s double‑wishbone front end, the upper and lower control arms locate the hub and manage steering geometry, the damper doesn’t rotate, so there’s no need for a strut top bearing. Lexus identifies these pieces as shock absorber supports/insulators rather than strut mounts in the service information.

If the 2011‑lexus‑is/strut-mounts page brought you here, the relevant service focus is the shock mounts/insulators and related hardware. Fresh, high‑quality rubber insulators keep noise, vibration and harshness down and help the damper work as designed.

• When replacing front or rear shocks, also renew: upper shock insulators/supports, coil spring seats/insulators, dust boots and bump stops.
• Listen for knocks over sharp bumps, feel for extra vibration through the body, and look for perished or cracked rubber around the shock tops — all signs the insulators are due.
• Inspect from about 80,000–100,000 km or whenever dampers are replaced. If the car sees rough roads, bring that forward.
• Use the Lexus torque specs and recheck ride height after reassembly. An alignment check is a smart move after any suspension work.

Quick tip: if a parts listing shows a “strut mount with bearing” for this model, it’s likely a generic label. For the 2011 IS, choose shock mounts/insulators that match the double‑wishbone/multi‑link layout noted in Lexus service documentation.

Popular questions

Does a 2011 Lexus IS have strut mounts?
No. Per Lexus Repair Manual and NCF, it uses double‑wishbone front suspension and multi‑link rear, so it has shock absorber upper insulators/supports rather than steering strut mounts with bearings.

What should be replaced with the shocks on a 2011 IS?
Plan on new upper shock insulators/supports, spring seats, dust boots and bump stops. That keeps noise down and helps the fresh dampers last.

What are the signs the shock top insulators are worn?
Clunks over bumps, extra vibration, vague front‑end feel, or visible cracking/perishing around the shock tops. Tyre cupping can also hint at tired suspension components.