BSWParts Air Spring Bag Replacement for Firestone W01-358-9978, Hendrickson S-28929
PREMIUM BUILD - Part number is permanently engraved for easy identification. Features 4.5-5.0 mm thick rubber that surpasses OEM standards, 25% stronger 4140-grade steel studs, reinforced composite pistons, and industry-leading leak test performance after final assembly.
REPLACEMENT FOR - Hendrickson C-28929, S-28929 // Firestone W01-358-9978 // Triangle AS-8959 // AS9978, HDV9978, HD9978 // Sampa SP559978-KP
SPECS - Extended Height: 18.00" // Compressed Height: 7.90" // Top Plate Width: 9.00" // Piston Width: 10.16" // Weight: 15.10 lbs
FITMENT - Contact your dealer to confirm the correct part number, then verify if this air bag is a suitable replacement. You can also compare the specs with the diagram provided. Important: Purchasing an air bag solely by make and model is a common mistake—always double-check compatibility before buying.
Shipping
- All orders are processed within 2 business days after payment is received.
- Tracking information will be provided once your order has shipped.
- Local pickup is available. Please contact us to arrange pickup.
- Orders are shipped only to confirmed PayPal addresses.
- Any address changes must be confirmed by our customer service team before payment.
- We do not ship to Hawaii, Alaska, APO/FPO addresses, or Puerto Rico.
- Shipping and return shipping charges are non-refundable.
Payment
- We accept PayPal and ship only to confirmed addresses.
- E-Check payments through PayPal are accepted. Orders will ship once payment clears, which typically takes 7–10 business days.
- Orders are shipped after payment has been completed.
- Checkout is expected within 3 days of purchase and payment within 4 days.
- Unpaid orders may be canceled after 4 days.
Returns
- A 10% restocking fee may apply to unused returned items after 30 days from the purchase date.
- All returned items must include original contents and components and require prior authorization.
- Return shipping costs are the responsibility of the buyer.
- We cover shipping costs for replacement items when applicable.
- Packages may occasionally be damaged during transit by the carrier.
- Please inspect your package before accepting delivery.
- If your package arrives damaged, contact us as soon as possible.
- We will assist with filing a damage claim with the carrier.
- Please retain all packaging materials and boxes for carrier inspection.
Warranty & Refunds
Air Spring Store provides warranty coverage for Torque Parts Truck & Trailer Air Springs, Air Brake Components, and Wheel Seals sold within the United States.
- Rolling lobe (reversible sleeve) and convoluted air springs for semi-trucks and trailers are covered by a Limited Lifetime Warranty.
- All other products, including pickup truck air springs, cabin air springs, air brake components, and wheel seals, are covered by a 1-Year Unlimited Mileage Warranty.
- Unused and uninstalled products are eligible for return within 30 days of purchase.
- Improper installation or misuse is not considered a manufacturer defect.
Products are warranted against defects in materials and workmanship under normal use during the warranty period. Air Spring Store may repair or replace defective products at its discretion.
This warranty does not cover cosmetic damage, normal wear and tear, misuse, improper installation, modifications, accidents, or damage caused by external conditions.
To request warranty service, please contact the original seller or vendor where the product was purchased. Proof of purchase is required for all warranty claims.