vin number for sidekick off road mini bike or sears allstate goat

#1
I have a sidekick scooter I think. The vin tag is missing. I want to register it for trail use in nh but, can't find out how to do so without a Vin number. Does anyone know how many digits it should be? I don't have a problem making one up. Nh doesn't check vin numbers on atvs.
 
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