The best replacement for iridium is platinum spark plugs.

The best alternatives to iridium are rated as following:
★★★★★  platinum spark plugs
★★★★  platinum
★★★★  globalstar
★★★★  polarized
★★★  inmarsat
★★  double platinum
★★  ngk iridium
★  copper spark plugs
★  platinum plugs
★  copper plugs
★  platinum spark plug
★  denso iridium
★  polarized lenses
  silver spark plugs
  thuraya
  ngk
  double platinum plugs
  laser iridium
  denso
  platinum spark
  platinum spark plugs best
  black iridium polarized
  e3 spark plugs
  orbcomm
  e3
  ngk laser iridium
  polarized lens
  iridium ix

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