This item is really 10.2mm and the coil wire is for HEI with internal coil. I only left three stars because the comments below the description said the coil wire is for the male-to-male coil, which is not the case. Asked for a replacement and also asked why it says 10.5mm when it was 10.2mm, they were quick to offer a refund on the returned item. I just wanted thick spark plug wires so I left them to modify the coil wire. So if your Chevrolet has a male coil then don't buy it.
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