Proper radiator support is essential for cooling system stability and longevity. The genuine Nissan Top Radiator Support Bushing (part number 21506-51E00) is the factory upper radiator mounting rubber used on the Fairlady Z32 and USDM 300ZX non-turbo (NA) models. This bushing cushions the top of the radiator in the support bracket, absorbing vibration and allowing controlled movement as the engine bay heats and cools.
Over time original upper radiator bushings harden, crack, or collapse, allowing the radiator to shift or rattle and potentially stressing hoses and mounts. Replacing worn bushings with the genuine Nissan part restores correct positioning and isolation. Catalog listings confirm this part is specified for non-turbo applications (“Upper. Without turbo”) and is the correct component for both JDM Fairlady Z32 and USDM 300ZX naturally aspirated models from approximately 1990–1996. Two bushings are typically required per vehicle.
Whether you are refreshing the cooling system, replacing a radiator, or addressing a loose or vibrating radiator, installing the correct OEM upper bushings helps maintain proper support and reduces unnecessary stress on related components. At Terra Firma Automotive, we supply this genuine Nissan Top Radiator Support Bushing for Z32 non-turbo owners who prefer authentic cooling system hardware. Choose Terra Firma Automotive for correct-fit Nissan parts that keep your Fairlady Z or 300ZX cooling system securely mounted.
- Genuine Nissan Top Radiator Support Bushing
- Part Number: 21506-51E00
- Application: Nissan Fairlady Z32 / USDM 300ZX Non-Turbo (NA)
- Position: Upper radiator mount
- Engine: VG30DE (naturally aspirated)
- Years: Approximately 1990–1996
- Specified for non-turbo models
- Cushions and isolates the radiator at the upper support
- Replaces hardened, cracked, or collapsed original bushings
- Two required per vehicle
- Restores correct radiator positioning and stability
- OEM rubber construction
- Trusted genuine Nissan component
- Available from Terra Firma Automotive
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