Alum C/O Sleeve 5in Bilstein/Koni/Penske

The Alum C/O Sleeve 5in Bilstein/Koni/Penske from ALLSTAR PERFORMANCE is a precision coil-over sleeve designed for high-performance suspension builders and racing enthusiasts who demand compatibility with industry-standard shock absorbers. This aluminum component serves as a critical interface between coil springs and premium shock brands, enabling seamless integration into custom or competition suspension systems. Whether you're building a street rod, race car, or performance upgrade, this sleeve provides the structural reliability needed for controlled spring seating and shock alignment.

Constructed from black anodized aluminum, the Alum C/O Sleeve features a 2.5-inch inner diameter spring seat and accommodates 2-inch-diameter shock bodies common to Bilstein, Koni, and Penske units. The 5-inch length provides sufficient engagement for stable coil positioning while the threaded design allows secure fastening and precise height adjustment during suspension setup. Black anodizing delivers corrosion resistance and a finished appearance that resists oxidation in harsh track or outdoor environments, extending service life across multiple seasons of hard use.

Suspension tuners, fabricators, and race teams benefit most from this universal-fit sleeve when constructing custom coil-over assemblies or replacing worn sleeves in existing systems. Its compatibility with Bilstein, Koni, and Penske shock platforms makes it an essential replacement and upgrade component for independent front suspension (IFS) conversions, drag racing setups, and road racing platforms. Installation is straightforward—the threaded design threads onto compatible shocks, and the spring seat accepts standard 2.5-inch coils, making this sleeve an industry-standard solution for professional and amateur builders alike.