Drum and Shoe Size

I appreciate that. I just went and measured and I got 1.75" which means my shoes should be 11x2.5". I tried putting new 11x2.5" shoes on that backing plate a couple days ago but the way the top of shoes encompass that round elevated bit where the springs and self adjuster cable get connected to doesn't seem right. The shoes encompassed that piece too high up and didn't allow enough room for both springs to sit. I'll give it another shot tonight and let you know how it goes, thanks!