okay, so i'm going to be a sophomore in high school. my high school have two different size lockers because they built onto a few years ago. there is f wing which is the freshman wing and the lockers were decent size ( i don't know the exact size). then there is the locker you get as a sophomore for the rest of high school and there thinner. they're all tall lockers but just thinner. so my question is, if i get a locker shelf (or two) are they adjustable so i can change the width to fit??