Shipping charges are not refundable unless the return is due to our mistake. The only exceptions to this are if you received a part number that is not what you ordered, an item arrived is defective, or if the manufacturer confirms that our catalog information is incorrect. Also, if you refuse the delivery of the package or the carrier returns a package because you provided an invalid address, the total cost of shipping for both sides of transportation (for delivery and for back-return) will be deducted from your refund.