About this part
Air spring bag / rubber bellows 1B-131 for truck, bus and industrial air suspension systems. Interchanges with W01-358-7731 (Firestone Airide). Supplied as a genuine new part, not remanufactured. Match the number cast or stamped on your existing bellows and confirm fitting dimensions before ordering. Availability, minimum quantity, lead time and packaging are confirmed with the quotation. The 12-month warranty is provided by DFM, not the original manufacturer.
Specifications
| Part number | 1B-131 |
| Condition | Genuine new part |
| Type | Rolling-lobe / convoluted air spring bellows |
| Cross-reference | W01-358-7731 (Firestone Airide) |
| Application | Truck, bus and industrial air suspension systems |
| Warranty | 12 months - DFM supplier warranty, not original manufacturer warranty |
Common questions
Is 1B-131 a genuine OEM part?
Yes. 1B-131 is supplied as a genuine new air spring bellows. It is not a remanufactured or aftermarket copy.
What does this air spring fit?
Cross-references: W01-358-7731 (Firestone Airide). Recorded application: truck, bus and industrial air suspension systems. Air springs of the same size family can share fittings across chassis brands, so send us the number stamped or cast on your existing bellows and we will confirm the match before dispatch.
How do I confirm the correct air spring?
Match the number cast or stamped on your existing bellows rather than appearance alone; fitting layout and stroke differ between similar-looking units.
Is the air spring tested before shipping?
Ask us to confirm the inspection steps and available records for this part number before ordering.
What warranty applies?
Warranty: 12 months, covering defects in materials and workmanship under normal use. Incorrect fitment and contamination damage are not covered.
Fitment note. Several part numbers in this family look similar. Confirm the number on your
existing unit, the engine model and the machine or vehicle application before ordering. Send us a nameplate photo
and we will verify the match before dispatch.
All manufacturer names, symbols and part numbers are used for identification and cross-reference purposes only. We are not an authorised distributor and are not affiliated with the original equipment manufacturer. Product condition is stated on each listing. Our 12-month warranty is provided by DFM, not by the original manufacturer.
