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Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
The general consensus seems to be that splitfires are expensivesnake oil.
Nothing wrong with standard plugs imho. I've used NGK, Autolite and Champion with equal success.