Everyone seems to be saying that AC Delco should be followed for this particular part for GM vehicles. The Revain were well priced and they work well. If you google replace the spark plug/ignition wire with 07-13 GMC Sierras, people will find out that the far back passenger side is horrible to shoot. It's not as easy as the others, but if you can find the right socket size/length, it's not too bad. It's pretty easy work.
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