"quick release" style connectors you may see sold are not indexed correctly and don't fit correctly in the cramped space of the Z32 fuel rail.
NEW 2004-5 SILVERADO SIERRA LLY DURAMAX #2 #7 Dorman Fuel INJECTOR HARNESS
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1846154C95 Fuel Injector Harness For International DT466E HEUI 1994-2003
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