Moog Standard Idler Arms

Brand: Moog | Part #STR-4EF578

Category: Steering > Idler Arms

The Moog Standard Idler Arms (P/N STR-4EF578) is a direct-fit Idler Arms for the vehicles listed in the fitment section. Tolerances on ball studs, sockets, and threads are held to OE service spec for accurate alignment and predictable steering response. Sourced from Moog, a recognized supplier in the aftermarket auto parts channel. Part number STR-4EF578 is the manufacturer reference — match it against your old part or VIN-based lookup to confirm you have the right unit. Confirmed fitment on 2019–2024 Mercedes-Benz including GLS, GLE, GLA. Use the year/make/model selector above to verify your exact configuration before checkout. Ships from a US warehouse in 1–2 business days. Free shipping on orders $75+, flat-rate ground otherwise. Backed by a 90-day return window — if the part doesn't fit or the wrong unit was shipped, send it back for a full refund.

Price: $347.99 | In stock — ships within 1-2 business days. Free shipping.