That is probably what I would do as well...
Do you still have your receipt? I'm just wondering if there are any UPC/SKU (stock) numbers on there, they could look it up to see if they have more, or they could order more for you.
Otherwise, like a previous poster said, make sure you have several inches all the way around, if there is enough left to piece to the top or bottom to make it big enough, than do that. Or use another piece of coordinating fabric and add it to the top and bottom of the back.
You'll figure something out! Don't be afraid to ask if you have more questions! :lol: Everyone here is super helpful!