The Mwongola Company is a small manufacturing company that uses gear assemblies to produce four different models of mountain bikes. One of these gear assemblies, the "Smooth Shifter", is used for the two most expensive of Mwongola's four models and has an estimated annual demand of $1000$ units. Mwongola estimates the cost to place an order is $$50,$ and the holding cost for each assembly is $$65$ per year. The company operates $250$ days per year. What is the economic order quantity for the Smooth Shifter?