Navistar/International Air Spring Bag – Replaces W01-358-9875 / W01-358-1191

Upgrade the suspension performance of your truck with the ROADWEST Air Spring Bag for Navistar International Trucks, engineered as a heavy-duty replacement for selected Navistar and cross-reference applications. This air spring is designed to match cross reference numbers Navistar FLTA 1R12432, 3541731C1, W01-358-9875 and W01-358-1191, helping you restore proper ride height and load support when installed on the correct suspension system.

Built from imported high-density rubber with a multi-ply bellows structure, the ROADWEST air spring is engineered to exceed typical OEM requirements. It provides excellent durability, improved load-bearing performance and long service life compared with many standard air suspension bags.

By effectively absorbing road shocks and vibrations, this air spring bag helps protect passengers and cargo from harsh impacts. It also contributes to better ride comfort, more stable braking and reduced driver fatigue, especially on long hauls or rough road conditions.

• Replacement application – designed to fit systems using cross reference numbers: Navistar FLTA 1R12432, 3541731C1, W01-358-9875, W01-358-1191.
• Premium air ride construction – made from imported high-density rubber that exceeds OEM requirements for durability and load capacity.
• Safety & comfort – air spring bags help prevent physical collision impact to passengers, greatly reducing potential injury and smoothing vibrations for maximum ride comfort and braking stability.
• Better driving experience – restores proper suspension support, reduces bounce and helps your truck handle more predictably after replacing worn or leaking bags.
• 1-year warranty – backed by a 1-year warranty and 100% quality assurance for peace of mind.

Key air spring structure:

• Piston – the lower section of the air spring, made from aluminium, steel or composite plastic. It provides the lower mounting arrangement through threaded holes or studs.
• Girdle hoop (centre ring) – a ring between the convolutions on convoluted-type air springs that helps maintain stability and shape.
• Bellows – the heart of the air spring. It typically includes at least four layers: an inner layer, two plies of cord-reinforced fabric and an outer protective layer.
• Bumper (bump stop) – a solid moulded rubber fail-safe device used in many suspension applications to help prevent excessive damage to the vehicle and suspension in case of sudden air pressure loss.

Fitment reminder:

• This is not a universal air spring.
• Always confirm the part numbers on your original air bag or suspension documentation before purchasing.
• Only purchase if your current air spring matches one of these cross references: Navistar FLTA 1R12432, 3541731C1, W01-358-9875 or W01-358-1191.
• If you are unsure, consult your mechanic or parts manager to verify compatibility.

If you are not sure whether this air spring fits your suspension, please confirm your original part number or consult a professional technician before purchasing.