I am wondering if anyone can help me. I was wondering about shutters on my home. I have all windows that measure 41 and 53 1/2 inches in hieght and want to buy standard exterior shutters should I go bigger or smaller. For the window that measures 41 inches there is a 39 or 43. Which one? And for the windows that measure 53 1/2 there is a sock size of 55 or 51. Which one?? I am puzzeled!!!!Thank you.