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Protier Strut Mount ST4991 – 2001–2003 Toyota Prius NHW11 Direct Replacement
by
flippancy
22 Aug 2026
The Protier Strut Mount ST4991 is a direct-fit OE-style replacement for the 2001–2003 Toyota Prius NHW11 front MacPherson strut top support. It includes an integrated, pre-greased sealed thrust bearing to restore smooth steering and eliminate low-speed clunks. The mount uses a SAE J200/ASTM D2000 M2BG710 elastomer grade for improved ozone and heat resistance. Torque specs: upper flange bolts ~29 ft-lb (39 N·m); center strut nut ~36 ft-lb (49 N·m). Fits left and right front positions. Professional installation is recommended, and after installation, verify the steering angle zero-point calibration via the vehicle's diagnostic system.