Whjich spark plugs wires to get that use the metal boots ?

[cottonpicker14]

I need new wires and currently have 8mm with the metal boots on a stock TTA.
What wires to get that fit AND where I can re use the metal boots ? Will the boots fit on 8.5 mm or should I stay with 8mm
I would like to get them pre made and not universal if possible. Also, where to buy them.
Thanks

 

[cottonpicker14]

Changed plugs today and they were brown in color

About 500 miles ago I changed my plugs (AC Delco R42LTS, gapped at .35) on my stock TTA.
Since then, I have been running a combo of 93 and 104 octane for a 98 octane, using a turbo tweak chip programmed for the 98 and 18 lbs of boost.
I had a small miss which turned to be a bad wire, but when I checked my plugs today, all the plugs were brown. The porcelin, electrode, etc was a brown color, almost the color of rust.
Any ideas whey all the plugs with only 500 miles would turn brown ?
Thanks