National Spring Premium Leaf Springs

Brand: National Spring | Part #SUS-B43607

Category: Suspension > Leaf Springs

The National Spring Premium Leaf Springs (P/N SUS-B43607) is a direct-fit Leaf Springs for the vehicles listed in the fitment section. Damping curve is tuned to match factory ride height and spring rate, preserving the original handling and steering feel. Sourced from National Spring, a recognized supplier in the aftermarket auto parts channel. Part number SUS-B43607 is the manufacturer reference — match it against your old part or VIN-based lookup to confirm you have the right unit. Confirmed fitment on 2007–2022 Infiniti, BMW, Lincoln including Q50, QX55, QX80, X7, Corsair, Navigator. 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: $290.99 | In stock — ships within 1-2 business days. Free shipping.