The best replacement for b20 block is b18 block.

The best alternatives to b20 block are rated as following:
★★★★★  b18 block
★★★  ls block
★  gsr block

Your alternative for b20 block is not listed? Suggest!
Speaking about b20 block, one probably shouldn't forget about b18 head.

Other search terms related to b20 block and their ratings are:
★★★★★ b18 head
★★★★★ b16 head
★★★★ gsr head
★★★ ls head
★★ type r head
★★ b18c head
★★ b18c1 head
b16a head
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b20 block
b18 block
ls block