2003 Tahoe Z71 Spark PLugs??

[Tony7781]

Hey guys, I have a 2003 Tahoe Z71 and am doing basic maintenance on it since i just purchased her. I am going to change the spark plugs but there seems to be alot of confusion. The owners manual says to use AC Delco 41-974. I read (after alot of googling) that those were discontinued and replaced by AC 41-985. Those also seem to have been discontinued and replaced by AC 41-110. When I look up that plug, it says on the websites that it doesn't fit my vehicle. Am I looking at the wrong plugs? If so do you have any recommendations? In addition if you know which wires and PCV valve which should be used I would appreciate that info.