The best replacement for 10.5 is 9.5 driver.

The best alternatives to 10.5 are rated as following:
★★★★★  9.5 driver
★★★  11.5 driver
★★★  9.5 loft
★★★  9.5
★★★  11.5
★★  9.5 driver loft
★★  12 degree driver
★★  7.5 sbr
★★  9 degree driver
★★  13 degree driver
★★  13.5 tog
★  14.5 barrel
★  11.5 loft
★  10.6
★  9.5 degree driver
★  12 driver
  10.4
  9.5 loft golf
  9 degree loft
  9.5 drivers

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Speaking about 10.5, one probably shouldn't forget about 10.4.

Other search terms related to 10.5 and their ratings are:
★★★★★ 10.4
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10.5
9.5 driver
11.5 driver