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Genuine Firestone Airide replacement air spring W01-358-9586 improves driver safety and productivity and require little or no maintenance. Replaces Holland-Neway 90557249. This air spring is a component of a heavy-duty air suspension system, designed for heavy duty trucks and trailers, and fits based on dimensions rather than specific year, make, and model. It features an inner layer, two plies of cord-reinforced fabric, and an outer cover made of natural rubber. The composite piston is lighter, more impact-resistant, and impervious to atmospheric corrosion, water, salt, and ice-melting chemicals.