The best replacement for b20 head is ls head.

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

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

Other search terms related to b20 head and their ratings are:
★★★★★ b18 block
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b20 head
ls head
b18 head