After you have received your unit, you still have the option to change the row configuration if necessary. You can exchange one row for one other row of a different size for $10, which consists of the plastic can tracks. Shipping charges associated with re-configuration will be your responsibility. If you would like to exchange your row configuration, please fill out the following Return/Exchange form and place it in your return box. Please call our office toll-free at 877-743-5373 with any questions or concerns you may have