The best replacement for a2 upper is a4 upper.

The best alternatives to a2 upper are rated as following:
★★★★★  a4 upper
★★★★★  flat top
★★★★  flattop
★★★★  a4
★  a3

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Speaking about a2 upper, one probably shouldn't forget about f marked fsb.

Other search terms related to a2 upper and their ratings are:
★★★★★ f marked fsb
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a2 upper
a4 upper
flat top