1.

http://www.napaonline.com/Search/Det...+3999999+13182

2.

http://www.napaonline.com/Search/Det...+3999999+13182

3.

http://www.napaonline.com/Search/Det...+3999999+13182

4.

http://www.napaonline.com/Search/Det...+3999999+13182

 

i got copper 3923's at walmart for about $1.50 or less each.

for the links you posted, the platinum and double platinum supposedly last longer. some people complain about the platinum, but my truck originally had them with no ill effects. my personal opinion is that any of the first 3 are fine, but i wouldn't pay $6+ for a damn iridium plug. it can't possibly be worth that much.

 

Why can't you find 3923's? I've seen thatm at checkers, Advanced, Autozone, Oreilly's, Napa, and even Walmart.

In my opinion, copper plugs are superior to the fancy platinum plugs and others in almost every way except one. Copper plugs don't last as long. Other then that, they work great in our trucks, and are a better plug anyway.