The best replacement for 11x is 19d.

The best alternatives to 11x are rated as following:
★★★★★  19d
★★★★  11b
★★★★  68w
★★★★  13f
★★★  18x
★★  dx8
★  12x
★  dx18
★  9503
★  xg11
  dx9
  futaba 8fg

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Speaking about 11x, one probably shouldn't forget about option 40 contract.

Other search terms related to 11x and their ratings are:
★★★★★ option 40 contract
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11x
19d
11b