When a portion of your order is back ordered, we will split your order, sending the in stock parts first, and the back ordered item(s) when they arrive at our warehouse. If your back ordered product is urgent, please contact us at 1-616-425-9141 so we may give you a more accurate time frame of when to expect the back ordered product. You may choose to wait for the item(s) on backorder, or request a refund for the back ordered items.