pennyswings

I have posted the picture of the quilt below again so you can all see it, in case you missed it.
Here is my quandery, I brought a coordinating fabric for the back and thought I would not have a problem with it fitting, but then I decided to do a small extra sashing around the quilt. Well that put me over by a half inch all around. I did not realise this until I went to sandwich the quilt. Now because they no longer make the fabrics 45 inches wide I only have the quarter inch selvage as extra on the sides of the quilt (the top and bottom I have plenty of fabric).
My question is do you all think that this will be enough extra material on the sides to allow for when I quilt the quilt? (Am I making any sense here? I do tend to over explain things, LOL.) Or do you all think that I should make a border on the back? I really did not want to have to do this because I love the way the back looks with a red binding alone, but I have a feeling it may be my best option. :hunf: