As an alternative to replacing it, you could send it to Glenn Yee for rebuild and blueprinting.
https://www.glennyeemotorsports.com/gt1_oilpumps.html
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
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