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Just a word of caution - they don't work very well.
I put them on 2 plug wires on my driver's side that were fairly close to the headers. 3 and 7 I believe. The wires melted underneath the "kool socks" very quickly (a few weeks as far as I can tell), and the sock itself was untouched. It actually caused a lot of problems because I didn't realize the plug wire was burned because it was covered by the sock. I had to remove them to inspect them and that's when I found they had been severely melted. I switched back to stock gm heatshields and zero problems since then.