I have the reproduction Autolite plug wire set on my '69 351W Mach 1. The wires are numbered, so it's easy to get the correct wire installed on the correct cylinder. As far as quality, I've been very happy with them on my car. I didn't have any original wires to compare to, but the wires on my car seem to fit and function as Ford intended. They certainly look a ton better than having generic parts store replacements.