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The tubes surround the spark plugs. So you basically just yank them out and replace them with new ones and pop the seals on them and reseat them.
Mine were in there real good due to age and heat.
Are you sure it was the spark plug tubes they quoted you 8 hours labor to replace? It's about a 1.5-2 hour job max if you have a lift. Doing it on the ground with jack stands takes a little longer, but it sure ain't 8 hours.
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