To find the matching RSVP card or any other items that match your design, visit the product page for your design and click on it to open the product page. Underneath the product image you'll see existing matching items and related products. Click on one of these to visit its product page and add it to your order.
If you cannot find a matching item, please contact the designer of the design you like to request a matching item. In most cases the designer should be able to apply the design that you like to the format that you need. Please note that there may be a custom fee charged for this.