Prothane 4-1705-BL Rear Coil Spring Isolators Black Polyurethane

The Prothane 4-1705-BL rear coil spring isolators are precision-molded from Prothane's high-performance black polyurethane compound, designed to replace the worn or deteriorated factory rubber spring insulators on the 2001–2003 Chrysler PT Cruiser. These isolators seat between the coil spring and the suspension perch, cushioning road shock, reducing noise and vibration, and restoring proper spring alignment.

Key Features:

• Manufactured from durable black polyurethane — far outlasting OEM rubber insulators
• Resists cracking, tearing, compression set, and chemical degradation from road fluids
• Tighter durometer than OEM rubber improves handling response and chassis feedback
• Precision-molded for a direct OEM-replacement fit — no trimming or modification required
• Sold as a set for both rear positions
• Easy DIY installation with standard hand tools

Polyurethane coil spring isolators are one of the most cost-effective suspension upgrades available. By eliminating the flex and collapse found in aged rubber, Prothane's isolators help maintain consistent ride height and improve overall suspension geometry. Part number 4-1705-BL is engineered specifically for the rear suspension of the PT Cruiser platform.