yup, easiest way to check bearings - see marking on bearing, exactly as Shuben said.

for sprockets I could advise to check this link and see whether Honda XR400 sprockets size match dimensions of Shineray's
http://www.jtsprockets.com/catalogue/model/877/

maybe you even don't need to take off X5 sprocket, just check some links on taobao, where seller show sprocket dimensions and then compare them to dimensions from link above.