The best replacement for 63 is 66.

The best alternatives to 63 are rated as following:
★★★★★  66
★★  series 66
★  65
★  77 k&n
★  617
★  heinz
★  series 7
★  mp 64
  cls 55
  77
  mp 53
  ap2
  m60
  p-64
  mp 59
  cayenne turbo s
  rf 83
  62
  57
  317
  mp 68
  68
  series 65
  55
  panasonic 65

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Speaking about 63, one probably shouldn't forget about series 7.

Other search terms related to 63 and their ratings are:
★★★★★ series 7
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63
66
series 66