Carter Shortster Parts Needed

#1
Hi all!!! I bought a mini bike for my son. I had no clue what is was until I posted on here. The mini is a Carter Shortster, I need a 60 tooth sprocket, #41 or 428. The bike had a 428 chain and did not fit the rear sprocket properly. So, I bought a #40 chain and it still does not fit. I'm not having any luck finding a rear sprocket to fit, either the holes are wrong or bolt pattern isn't right. If anyone has any parts for this bike please let me know. Thanx!
 

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