There's four different options here for plugs and wires. Which would I get for a 2014 6.0L vortec in a 2500HD? Also what's better the platinum or iridium? Truck won't be driven a lot but I want it to purr when it does 
https://www.amazon.com/ACD-OEM-41-9...3737861&sprefix=41-962+ac,aps,198&sr=8-4&th=1

https://www.amazon.com/ACD-OEM-41-9...3737861&sprefix=41-962+ac,aps,198&sr=8-4&th=1