Firestone 8058 W01-358-8058 Rolling Lobe Air Spring Assembly 1T19ZK-5.7

The Firestone 8058 (W01-358-8058) is a genuine Rolling Lobe Air Spring Assembly designed for heavy-duty truck and trailer air suspension systems. Built to exacting OEM standards, this air spring delivers consistent ride quality, load support, and long-term durability in demanding commercial transport applications.

This air spring features the 1T19ZK-5.7 flexmember and is paired with piston number 9640. The rolling lobe design provides a smooth, progressive suspension response that helps absorb road shock and vibration, reducing driver fatigue and protecting cargo during long-haul operations.

Key Features:

• Genuine Firestone Rolling Lobe Air Spring — OEM quality construction
• Flexmember Number: 1T19ZK-5.7
• Piston Number: 9640
• Full Part Number: W01-358-8058 (also referenced as 352-8058)
• Top plate width: 11.31"
• Piston width: 11.62"
• Compressed height: 5.80"
• Extended height: 19.25"
• Approximate weight: ~21–25 lbs

Cross-Reference / Replaces:

• Firestone: W01-358-8050, W01-358-8058
• Goodyear: 1R14-039, 1R14-055, 1R14-083
• Hendrickson: S-4771, C-4771, B-12514-013
• ContiTech: 1110 5C-16

This air spring is a direct OEM replacement for Hendrickson suspension systems and is manufactured in the USA. It is ideal for fleet operators and repair facilities seeking a genuine Firestone part to restore factory suspension performance on heavy-duty trailers and commercial trucks.