The best replacement for t-1 is t-3.

The best alternatives to t-1 are rated as following:
★★★★★  t-3
★★  pri
★  h-1
★  e-1
★  eotech
  eotech xps
  ds 1
  isdn pri
  t-38

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No companions for t-1 have been suggested so far.
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Google Trends

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t-1
t-3
pri