Lightened flywheel

hi
I have a pre faclift k11 running a ga16. I’m currently trying to lighten my ga16 flywheel but the engine company needs a crank to balance it on and I can’t find a ga crankshaft. My question is does a cg10 or 13 crank fit a ga flywheel and had anyone got one or does the cg flywheel fit the ga engine if so does anyone have a lightened flywheel they want to part with?
Any help appreciated
Thanks
Steve
 
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