The best replacement for 503 is 404.

The best alternatives to 503 are rated as following:
★★★★★  404
★★★★★  watson 540
★★★★★  iep
★★★★  582
★★★  522
★★★  501
★★  bh 505
★  502
★  asha 311
★  500cm
  watson 853
  watson 387
  540
  m361
  500

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Google Trends

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503
404
watson 540