In case anyone is looking for hard to find Ultra parts (like the torque sensor or the plastic side cover that hides the motor mount nuts and electrical connectors) a company called GBK (Green Bike KIt) has them and many other parts for the Ultra motor. You deal with a woman named Anna Lee who is very efficient and quickly responds to questions. The company is out of China and has always gotten back to me the day after I have contacted them. Their prices are not bad but there is a shipping fee.