The best replacement for 9004 is h4.

The best alternatives to 9004 are rated as following:
★★★★★  h4
★★★★  9006
★★★★  9007
★★★  9007 bulbs
★★★  9003
★★  iso 9001
★  9002
★  9001
★  9007 headlight bulb
  9007 bulb
  iso9004
  slim skim
  9007 headlights
  iso 9004
  9005 bulbs

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9004
h4
9006