I AM INTERESTING TO FIND 2 ELECTRIC MOTORS 48V 250W TAKES MY SCOOTER {..BUT I PREFER 350W IF I CAN PUT ON IT WITHOUT PROBLEM?}..BY THE TIRE OF THE BACK 16' WHEEL...DO YOU SHELL SOMETHING LIKE THAT AND HOW MUCH DO THEY COST BOTH OF THEM INCLUDES DELIVERY TO SEND AT GREECE..?THANKS..