I just installed these leads along with new spark plugs on my 2006 Chevy Silverado 5.3L and they fit perfectly. I used Delphi round coils in my truck, which I found out after doing some research with these wires. Just don't forget to apply dielectric grease to the dust bags before installation. I had to resort to simply pulling the original wires past the heat shields with long pliers and needles because otherwise it would be such a PITA to pull the old ones out. Rely on these OEM cables.
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