Save Your Money!
These are, indeed, Golden Motor kits. All I can say is buyer beware! I purchased a 48v kit with a regenerative controller directly from GM in China. The controller quit functioning after less than a mile. No one will answer my emails about replacement.
The kit came with NO instructions, the wheel was okut of round and wobbled side to side. Connections on the controller were not labeled, one of the brake switches was bad.
If this is a dealer operating in this country, you may have better luck.