For 宗申GY [ZS125GY/ ZS200GY-A]
http://item.taobao.com/item.htm?id=7474962535
Measures or bring it to bike shop, experienced old timer will find something that works...
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Genuine Zongshen Sierra cap [61110-L266-0000] seems also works
https://detail.tmall.com/item.htm?id=19915873613