This OEM-quality belt fits 2008-2014 WRX and STI, and most other similar vintage Subaru models with an A/C belt tensioner. It's made by Mitsuboshi, the same company that makes the factory Subaru belt. It probably IS the exact same belt; but since it doesn't go through the Subaru dealer network, it costs a lot less.
Fits all 2008-2014 Subaru WRX, and 2008-2020 WRX STI.