>>6734433I got the model and the add on from Mandarake.
You can still get the kit from AmiAmi:
http://www.amiami.com/top/detail/detail?gcode=TOY-SCL2-31714 but it looks like they stopped selling the motors. Even Plamoya doesn't have them anymore.
You can try stalking Mandarake/YJA/Ebay/Amazon but expect to overpay.