battery for '65 suburban 10

howdy all --- time to get a battery for the suburban 10, it did not have one in it when it followed me home. Had been told that a type 51 car battery would fit. It is just a scoosh too long. What are y'all using?

thanks
kevin

I've always used the inexpensive Walmart batteries in my tractors.

thanks spence -- which size do you use? I'm inclined to get the biggest that will fit with the most cca.