8 3/4 drum brake question

So I have a 1963 dart that has a slant 6 and and 8 3/4 in it . I know the rear end was put in it sometime between 1964 and 2012 :). My question is how can I tell what size my shoes are.The problem I have is the brakes aren't working and before I start beating and cussing at it I wanna make sure I have the correct parts to replace them. It's got 14" sbp steelies and when I pulled the wheel off the drum looks like a giant bell and I have found nothing that's looks like them. Thanks in advanced.