Cusco 684 421 A65 Non-Adjustable Rear Pillowball Upper Mount ID65 Springs

The Cusco 684 421 A65 is a fixed (non-adjustable) rear pillowball upper mount designed exclusively for use with coilover or aftermarket springs with an inner diameter (ID) of 65mm. This is a direct upgrade over the factory rubber strut mount, replacing compliant OEM components with a solid pillowball assembly for improved suspension response and alignment consistency.

Cusco pillowball upper mounts eliminate the flex inherent in stock rubber mounts, providing more direct road feedback and keeping suspension geometry at its static setting even under hard cornering, braking, and acceleration loads. The result is sharper turn-in, more predictable handling balance, and improved stability at speed.

Key Features:

• Fixed/Non-Adjustable Type — Center-lock pillowball design for consistent, repeatable suspension geometry
• ID65 Spring Compatibility — Designed specifically for coilover springs with a 65mm inner diameter
• High-Strength Duralumin Construction — 6mm thick plate manufactured from 2017S aerospace-grade duralumin aluminum for durability with reduced weight
• Replaces Factory Rubber Mounts — Eliminates compliance and deflection associated with OEM rubber for more direct suspension response
• Rear Position — Specifically engineered for the rear strut towers
• Improved Cornering Stability — Maintains static alignment settings during dynamic loads for consistent handling behavior

This mount is a recommended pairing when installing a coilover suspension kit using ID65 springs on the Subaru Legacy BP5 (Touring Wagon) or BL5 (B4 Sedan). Note: This is the fixed non-adjustable version. For camber adjustment capability, a different Cusco upper mount part number is required. Confirm spring inner diameter before ordering — Cusco also offers A60 variants for ID60 springs.