[humanbeing]

[]= piston diameter
110[52.4] https://item.taobao.com/item.htm?id=36141623524
100[50] https://item.taobao.com/item.htm?id=35713153747
90[47] https://item.taobao.com/item.htm?id=35713399289
<Shorter barrel height>
70[47] https://item.taobao.com/item.htm?id=35713293961
50 [39]
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A chinese piston maker http://www.jhpiston.com/about_can/ that made comparing job easier