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These super-strong Tenzalloy (713 alloy) uprights are based on the design used on the 1985 Reynard Formula Ford. They have been redesigned and strengthened for use on heavier cars with larger tires. More than 100 of these units have been in service over the past 10 years with no casting failures (despite a couple of concrete barrier incidents). They have been in use for many years by the Bridgestone Racing School as well as on the Aero FF (AIM Autosport's winningest Canadian FF for several years). This upright can be used as the basis for original construction.
One upright will fit front or rear, left or right, so just one spare will cover all four corners!