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I recently replaced the original plugs in my '01 2.7 with Bosch 7413 plugs. Per a phone conversation with Bosch, the 7413 is the only plug that they make for the 2.7.
Rockauto.com has them for $6 or $7 each.
As far as plug life is concerned, the Bentley lists something like 4 years/60k miles. Mine were 8 years/19k miles, so I figured what the hell... plus working in these things is a good time.
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