"For a Subaru EJ251 engine, you'll need a short block that is specifically designed for the EJ251 naturally aspirated, SOHC (Single Over Head Cam) engine, typically found in?Impreza, Forester, Legacy, Outback, and Baja models from 2000-2005" from Google
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Maybe try availability up to 2005.? eg:? https://parts.subaru.com/p/Subaru_2005_Impreza/Short-Block-Engine/49223014/10103AB660.html
