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You can get to them all without removing wheel well walls, just depends on how much patience you have. #8 and #7 aren't bad if you have a long handled ratchet, wrench, or whatever to get some leverage if needed to get it loose. My #8 was stuck so I had to slide a jack handle over my ratchet to extend it out to about 2' and get some leverage.
Threading in the new ones on #8, #7 takes patience and a good ability to work from sensory feel/touch alone without being able to see the hole.
Be sure to use a good copper or aluminum based anti-seize compound on the threads of the new plugs, but you knew that already.
Good luck, and have fun with it. What type of new plugs you goin' with? The new NGK TR55ix Iridiums look pretty good, strong spark and long life. If your ignition system is stock you might want to consider staying with a platinum plug or going with iridiums, just my opinion and you know what they say about opinions. :thumbs: