I use a ktm ytx5l-bs with a 2008 ktm 450 battery tray, that's your general style liquid filled battery.
I'm gonna change it for a ytx5l-bs lithium ion battery as they can take a better draw and they last a bit better.
Here's a picture of the setup I made, it hangs off of the bar underneath the radiator. And sits behind the bumper. The tray wasn't even $10 new, and the 2 pieces of angled Ali were free from work.