The best replacement for gu4 is gu5.3.

The best alternatives to gu4 are rated as following:
★★★★★  gu5.3
★★★  mr11
★★  g4
★  gu10
★  gz4
★  mr16

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No companions for gu4 have been suggested so far.
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Google Trends

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gu4
gu5.3
mr11