The best replacement for 6x8 is 5x7.

The best alternatives to 6x8 are rated as following:
★★★★★  5x7
★★★★  6.5
★★★★  5.25
★★★  6x9
★★  5 1/4
★  5 1 4
★  6x7
★  6.5 speakers
★  5x7 speakers
★  6 1/2
★  6x9 speakers
  6.5 speaker

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Google Trends

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6x8
5x7
6.5