The best replacement for old bay is crab boil.

The best alternatives to old bay are rated as following:
★★★★★  crab boil
★★★  tony chachere's
★★★  chesapeake bay seasoning
★★★  creole seasoning
★★★  jo
★★  zatarain's
★  seafood magic
★  jo spice
★  lawrys
★  cajun seasoning
  lawry's

Your alternative for old bay is not listed? Suggest!
Speaking about old bay, one probably shouldn't forget about blackened seasoning.

Other search terms related to old bay and their ratings are:
★★★★★ blackened seasoning
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old bay
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