Rear Axle-Outer CV Constant Velocity Boot is a direct fit for the following:

2013-2017 Subaru Crosstrek
2004-2018 Subaru Forester
2002-2018 Subaru Impreza
2002-2018 Subaru WRX

2007-2018 Subaru WRX STI

Genuine Subaru Part Number: 28423FE010