Fuel Filter Head Spacer, LML 2011-2016, Duramax - 10368
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Amazon.com: 6.6L Duramax Diesel Fuel Filter with Head Assembly│Replacement For 2005-2012 Chevy Silverado GMC Sierra 2500 HD 3500 HD with Water in Fuel Sensor│Replaces# 12642623, 12639448, 904517 : Everything Else
01-16 Duramax Cat Fuel Filter Housing | Black Market Performance