12mm Piston Pin Cylinder Rebuild Kit 47Cc & 49CC Mini Pocket Bikes Quad 4 Wheeler

I bought this rebuild kit for a 49CC Pocket bike. Come to find out, it is actually a 43CC engine. I couldn't tell until I removed the cover and the cylinder head. I found the markings and found out it wouldn't fit. So I figured " no big deal, ill exchange it." Then come to find out Amazon doesn't allow returns or exchanges of parts the have come in contact with hazardous materials. So now I'm stuck with a rebuild kit that doesn't even fit my bike.Moral of the story is know what you need before buying and pay attention to the return policies .