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Spend my 02¢ wisely...
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Factory plugs 110K were single platinum, that is platinum on the center electode only.
The factory plugs on the rear bank are double platinums. This is due to the way the factory waste spark system works. The rear plugs actually fire in reverse polarity on the waste spark. It's simply penny pinching by Ford to put single platinums on the front bank. I would just buy double platinums or iridiums for all 6 cylinders for peace of mind, but you could use AP-104's on the front bank and APP-104's on the back.

BTW, Wal-Mart has great prices on Autolite plugs. I bought 6 double platinum APP-104's for under $25 with sales tax.
 
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