THIS FITS YOUR 2016 Subaru STI Base

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Rocker Panel Reinforcement. Side Sill. REINFORCED Sill SD R (Left, Inner).

Part Number: 51572FJ2609P

Reinforcement Structure used on the Rocker Panel.

REINFORCEMENT-SIDE SILL INNER,LEFT Rocker Panel ReinforcementRocker Panel

Fits Crosstrek, Forester, Impreza, STI, WRX