You have 3.5" extra in the width, which is plenty if you're basting the top and quilting on a DSM. If it is to be loaded on a longarm there might be a problem, since the 3 pieces aren't basted together and without careful handling the batting could shift so that there isn't enough by the time you get to the bottom. If this happened, you could always cut off some of the excess length of the batting and hand sew it to the side of the batting where it is needed.