I've never seen on of those things. From the verbiage it seems this is an adapter that fits inside the factory filter housing, to allow one to use a non-standard length filter cartridge. That's just a guess, and I'm gonna feel really bad if everyone else has one.
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2000 Boxster S
2010 Volvo XC60
2011 GMC Denali HD 6.6L (sold)
2008 Cayenne S (sold)
1989 Targa (sold)
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