*For customers who want to change their order to a higher price , who want to pay for customized order or price difference. *For customers who want to order extra parts for our products. *For Example, your origin order amount is $79.99, and you want to buy more and change your order amount to $109.99, please make the "Quantity you buy" 30, and we will check your total amount to send you the right item. *This item also apply to the extra shipping fee charged by shipping company, such as UPS Next Day Air or USPS Priority. For example, the standard shipping method on our website is USPS Standard Shipping, but If you need your items urgently, the shipping company charges extra Fee, so you will need to pay the extra shipping fee for your items, and make the "Quantity you buy" equals the extra shipping fee. After we receive the payment, we will arrange the delivery by your specified shipping method asap. Order extra parts Pay for customized order or price difference