Kenworth Air Spring Bag – Heavy-Duty Suspension (C81-1005/C81-1004) – Replaces W01-358-9541/9547

Upgrade or restore your Kenworth suspension with the ROADWEST Air Spring Bag, engineered as a heavy-duty replacement for popular Kenworth air ride applications. This suspension air bag is designed to replace W01-358-9541, W01-358-9547, C811005, C811004 and cross to Contitech 9 9-10 P 861, delivering reliable load support and a smoother ride for long-haul and vocational trucks.

Built from high-density imported rubber, this air spring is made to exceed typical OEM standards. The reinforced construction offers excellent load capacity, better resistance to cracking and fatigue, and longer service life compared to many standard aftermarket bags. Whether you are running line haul, regional routes or heavy-duty work, this air spring helps keep your suspension performing at its best.

By effectively absorbing road shocks and vibration, the ROADWEST air spring improves driver comfort and helps protect cab components, cargo and chassis from harsh impact. It also contributes to more stable braking and handling, giving you a safer and more controlled driving experience, especially under load.

Installation is straightforward when the correct cross reference is matched. This air bag is intended as a direct replacement for suspension systems that originally used W01-358-9541 / W01-358-9547 / C811005 / C811004. Simply remove the worn or leaking original bag, install the new air spring in its place, and check for proper ride height and air-tight connections.

• Perfect fit for Kenworth air suspension – designed to replace Kenworth C811005 / C811004 and equivalent assemblies.
• OE cross references – compatible with W01-358-9541, W01-358-9547, Contitech 9 9-10 P 861 and related numbers (verify all part numbers before ordering).
• High-density rubber construction – exceeds typical OEM durability, providing enhanced load-bearing performance and long service life.
• Improved safety & comfort – absorbs vibration and impact, helping reduce driver fatigue and improving braking stability.
• Easy installation – direct replacement design for compatible Kenworth suspensions; no major modifications required.
• Warranty support – backed by a 1-year warranty and dedicated customer service.

Fitment Reminder: This is not a universal air bag. Always confirm the part number on your original air spring or suspension documentation. Only purchase if your truck currently uses one of the following numbers: W01-358-9541, W01-358-9547, C811005, C811004, Contitech 9 9-10 P 861. If you are unsure, consult your mechanic or parts manager before ordering.